category.连接器_category.连接器品牌厂家，型号_价格_规格

类别是'category.D-Sub连接器' (10000)

所有品牌

产品型号	品牌	数据表	库存	价格(含增值税)	数量	工厂交货时间	生命周期状态	触点镀层	底架	安装类型	外壳材料	材料	介电材料	房屋材料	本体材质	终端数量	安装选项1	外壳材料，完成	板安装选项	安装选项2																																											操作温度	包装	系列	JESD-609代码	无铅代码	零件状态	湿度敏感性等级(MSL)	终止次数	终端	ECCN 代码	连接器类型	类型	定位的数量	最高工作温度	最小工作温度	颜色	行数	性别	附加功能	HTS代码	电容量	MIL一致性	符合 DIN 标准	过滤功能	触点类型	混合接触	选项	额定电流	螺距	触头总数	方向	入口保护	端子间距	深度	Reach合规守则	额定电流	外壳完成	参考标准	触点表面处理	终端样式	电压 - 额定交流	可靠性	审批机构	PCB行数	接头数量	PCB接触图案	配套信息	UL可燃性规范	房屋颜色	引线长度	空壳	本体深度	工作电压	额定电流（信号）	触点样式	触点电阻	线规	绝缘电阻	法兰特性	配套触点间距	主体/外壳样式	弱电	最大电源电压	终端类型	镀层	介电耐压	连接器样式	端口的数量	PCB 触点行距	耐用性	拉坯力 - 最小值	触点形式	孔直径	后退间距	最大电源电压（AC）	触点排列	产品	安装角	特征	产品长度	产品长度(mm)	长度	宽度	材料可燃性等级
FCE17C37SE2D0	Amphenol ICC (Commercial Products)	数据表	N/A	-	最小起订量: 1 最小包装量: 1	7 Weeks	通孔	通孔	Thermoplastic, Glass Filled	Glass	Steel, Tin Plated									磷青铜		-40°C~85°C	Tray	2013	FCE17	e3	yes	活跃	1 (Unlimited)		Solder		Receptacle, Female Sockets		37			Black	2									Signal			2.76mm		Straight				unknown	5A			Gold																					Housing/Shell (Unthreaded)							D-Sub											4 DC C										Filter							15.0μin 0.38μm			UL94 V-0			符合RoHS标准
D15S33E4GL00LF	Amphenol ICC (FCI)	数据表	300 In Stock	1: ¥10.499402 10: ¥9.905097 100: ¥9.344431 500: ¥8.815501 查看所有的价格 -	最小起订量: 1 最小包装量: 1	10 Weeks	Gold, Tin	通孔	Through Hole, Right Angle	Thermoplastic	Thermoplastic	Steel, Tin Plated									磷青铜	300V	-55°C~125°C	Tray		Delta D			活跃	1 (Unlimited)	15	Solder		Receptacle, Female Sockets		15	125°C	-55°C	Black	2	Female								Signal			5A	2.84mm		直角			18.77mm		5A			Gold																					Housing/Shell (M3)			300V		Tin		D-Sub	1										2 DA A					0.318 (8.08mm)					Board Lock, Mounting Brackets					39.14mm		Flash			UL94 V-0	无		符合RoHS标准
D09P23B6PA00LF	Amphenol ICC (FCI)	数据表	35280 In Stock	1: ¥10.950902 10: ¥10.331040 100: ¥9.746264 500: ¥9.194588 查看所有的价格 -	最小起订量: 1 最小包装量: 1	10 Weeks	GXT, Gold, Tin	通孔	Through Hole, Right Angle	Polyester	Polyester	Steel, Tin Plated									Brass	300V	-55°C~125°C	Tray		Delta D			活跃	1 (Unlimited)	9	Solder		Plug, Male Pins		9	125°C	-55°C	Black	2	Male								Signal			5A			直角			20.55mm		5A			Gold or Gold, GXT™																					Housing/Shell (Unthreaded)							D-Sub	1										1 DE E					0.409 (10.40mm)		300V			接地凹痕					30.81mm		30.0μin 0.76μm			UL94 V-0			符合RoHS标准
D09S90C6GL00LF	Amphenol ICC (FCI)	数据表	360 In Stock	1: ¥10.731007 10: ¥10.123591 100: ¥9.550557 500: ¥9.009960 查看所有的价格 -	最小起订量: 1 最小包装量: 1	17 Weeks	Gold	通孔	通孔	Polybutylene Terephthalate (PBT)	PBT	Steel, Tin Plated									磷青铜	300V	-55°C~125°C	Tray		Delta D			活跃	1 (Unlimited)	9	Press-Fit		Receptacle, Female Sockets		9	125°C	-55°C	Black	2									Signal			5A	2.74mm		Straight			12.55mm		5A			Gold																					Housing/Shell (M3)							D-Sub	1										1 DE E										板锁					30.81mm		30.0μin 0.76μm			UL94 V-0			符合RoHS标准
09663526613	HARTING	数据表	10 In Stock	1: ¥55.618911 10: ¥52.470670 100: ¥49.500632 500: ¥46.698710 查看所有的价格 -	最小起订量: 1 最小包装量: 1	7 Weeks	Gold	通孔	Through Hole, Right Angle	Polybutylene Terephthalate (PBT), Polyester, Glass Filled	Steel							未说明	Copper Alloy	GLASS FILLED POLYBUTYLENE TEREPHTHALATE-POLYESTER				-55°C~125°C	Tray				yes	活跃	1 (Unlimited)	25	Solder	EAR99	Receptacle, Female Sockets						2	Receptacle		8536.69.40.30		NO	YES	YES	NO	Signal	NO	GENERAL PURPOSE	6.5A	2.76mm	25	直角			21.2mm		7.5A	TIN	UL					2		STAGGERED	MULTIPLE MATING PARTS AVAILABLE			94V-0			NO								Mating Side, Female Screwlock (4-40)	PLUG						D-Sub	1				3.336 N	3.336 N				Stamped	3 DB B					0.409 (10.40mm)		1kV			板锁					53.2mm	12.5mm				UL94 V-0		无SVHC	ROHS3 Compliant
DCMMN17H5PN	ITT Cannon, LLC	数据表	N/A	-	最小起订量: 1 最小包装量: 1	12 Weeks	Panel, Through Hole	Panel Mount, Through Hole	Polycyclohexylenedimethylene Terephthalate (PCT)	Polyester	Steel, Yellow Chromate Plated Zinc									Copper Alloy		-55°C~150°C	Bulk	2011	24308-Style, Combo D®, D*MM			活跃			Solder		Plug, Male Pins		17 (12 + 5 Power)			Black	2	Male				YES	NO	NO	NO	信号和电源	YES	GENERAL PURPOSE	7.5A 40A			Straight					7.5A			Gold					17		MULTIPLE MATING PARTS AVAILABLE			94V-0			NO				Pin				Mating Side, Female Screwlock (4-40)							D-Sub, Combo								7.5A		Machined	4 DC C - 17W5										Board Lock, Shielded							50.0μin 1.27μm			UL94 V-0	无		Non-RoHS Compliant
DDM50SR	ITT Cannon, LLC	数据表	N/A	-	最小起订量: 1 最小包装量: 1	12 Weeks	Panel, Through Hole	Panel Mount, Through Hole, Right Angle	Polycyclohexylenedimethylene Terephthalate (PCT)	Polyester	Steel, Yellow Chromate Plated Zinc									Copper Alloy		-55°C~125°C	Bulk	2011	D*M			活跃			Solder		Receptacle, Female Sockets		50			Black	3	Receptacle				NO	NO	NO	NO	Signal	NO	GENERAL PURPOSE		50	直角					7.5A			Gold							MULTIPLE MATING PARTS AVAILABLE			94V-0			NO								Housing/Shell (Unthreaded)							D-Sub										Machined	5 DD D										Shielded										UL94 V-0	无		Non-RoHS Compliant
D15P91C4PA00LF	Amphenol ICC (FCI)	数据表	300 In Stock	1: ¥6.111784 10: ¥5.765834 100: ¥5.439466 500: ¥5.131572 查看所有的价格 -	最小起订量: 1 最小包装量: 1	11 Weeks	Gold, Tin	通孔	通孔	Polybutylene Terephthalate (PBT)	PBT	Steel, Tin Plated									磷青铜	300V	-55°C~125°C	Tray	2006	Delta D			活跃	1 (Unlimited)	15	Press-Fit		Plug, Male Pins		15	125°C	-55°C	Black	2	Male								Signal			5A			Straight			12.55mm		5A			Gold																					Housing/Shell (Unthreaded)							D-Sub	1										2 DA A							300V			接地凹痕					39.14mm		Flash			UL94 V-0			符合RoHS标准
09643227230	HARTING	数据表	23 In Stock	1: ¥389.569723 10: ¥367.518609 100: ¥346.715672 500: ¥327.090250 查看所有的价格 -	最小起订量: 1 最小包装量: 1	PCB, Through Hole	通孔	Polycyclohexylenedimethylene Terephthalate (PCT)	Glass	Steel											未说明	Copper Alloy	100V	-20°C~125°C	Bulk				yes	活跃	1 (Unlimited)		Solder		Plug, Male Pins		25			Natural	2	Male	面板安装		1nF	NO	NO	NO	YES	Signal	NO	GENERAL PURPOSE	2.84mm	25	Straight			17.2mm		7.5A						UL							94V-0			NO								Housing/Shell (Unthreaded)							D-Sub										Machined	3 DB B										Filter, Grounding Indents					53mm	12.5mm				UL94 V-0			ROHS3 Compliant
09670095615	HARTING	数据表	1500 In Stock	1: ¥14.879300 10: ¥14.037075 100: ¥13.242524 500: ¥12.492947 查看所有的价格 -	最小起订量: 1 最小包装量: 1	4 Weeks	Gold	Free Hanging, Panel	Free Hanging (In-Line)	Thermoplastic	Polybutylene Terephthalate (PBT), Polyester, Glass Filled	Metal	Steel							Copper Alloy		-55°C~125°C	Bulk				yes	活跃	1 (Unlimited)	9	焊杯		Plug, Male Pins						2	Male				NO	NO	NO	NO	Signal	NO	GENERAL PURPOSE	2.77mm	9	Straight			17mm		7.5A	TIN	UL								MULTIPLE MATING PARTS AVAILABLE						NO						20 AWG		Housing/Shell (Unthreaded)		RECEPTACLE					D-Sub	1				3.336 N	3.336 N				Machined	1 DE E				PREASSEM CONN					1kV	接地凹痕					31.2mm	12.5mm				UL94 V-0	无	无SVHC	ROHS3 Compliant
1757828-3	TE Connectivity Aerospace, Defense and Marine	数据表	250 In Stock	1: ¥202.104088 10: ¥190.664233 100: ¥179.871919 500: ¥169.690493 查看所有的价格 -	最小起订量: 1 最小包装量: 1	10 Weeks	ACTIVE (Last Updated: 2 days ago)	通孔	通孔	Steel	Steel, Yellow Chromate Plated Zinc									Brass		-55°C~125°C	Bulk	2007	Military, MIL-DTL-24308, AMPLIMITE 109			活跃	1 (Unlimited)		Solder		Receptacle, Female Sockets		25			Black	2	Female				YES	NO	NO	NO	Signal	NO	GENERAL PURPOSE		25	Vertical					5A			Gold												3.9624mm	NO								Housing/Shell (Unthreaded)			Compliant		Zinc		D-Sub	1						无				3 DB B			3.048 mm														10.0μin 0.25μm						符合RoHS标准
09644147212	HARTING	数据表	23 In Stock	1: ¥656.794630 10: ¥619.617575 100: ¥584.544881 500: ¥551.457434 查看所有的价格 -	最小起订量: 1 最小包装量: 1	Gold	Board Lock, Through Hole	Through Hole, Right Angle	Polycyclohexylenedimethylene Terephthalate (PCT)	Glass	Plastic	Steel									未说明	Copper Alloy	-20°C~125°C	Bulk				yes	活跃	1 (Unlimited)		Solder		Receptacle, Female Sockets		37			Natural	2	Receptacle	面板安装		47pF	NO	NO	NO	YES	Signal	NO	GENERAL PURPOSE		37						7.5A										MULTIPLE MATING PARTS AVAILABLE			94V-0			NO		100V			10mOhm		1GOhm	Housing/Shell (4-40)							D-Sub										Machined	4 DC C					0.401 (10.20mm)					Board Lock, Filter, Mounting Brackets										UL94 V-0		无SVHC	ROHS3 Compliant
171-025-113R911	NorComp Inc.	数据表	2757 In Stock	1: ¥36.244630 10: ¥34.193046 100: ¥32.257590 500: ¥30.431689 查看所有的价格 -	最小起订量: 1 最小包装量: 1	14 Weeks	通孔	Panel Mount, Through Hole	Metal	Polyamide (PA9T), Nylon 9T	Nylon	Steel	Steel, Nickel Plated							Brass		-50°C~100°C	Tray	2009	171		yes	活跃	不适用		Solder	EAR99	Plug, Male Pins		25			Black	2	Male		8536.69.40.30		NO	NO	NO	NO	Signal	NO	GENERAL PURPOSE		25						5A			Gold							MULTIPLE MATING PARTS AVAILABLE			94V-0			NO								Board Side (4-40); Mating Side, Female Screwlock (4-40)							D-Sub										Stamped	3 DB B										Board Lock, Grounding Indents				9.93mm	53mm	12.6mm	Flash			UL94 V-0		无SVHC	ROHS3 Compliant	UL94 V-0	无铅
09663186501	HARTING	数据表	29 In Stock	1: ¥99.462780 10: ¥93.832816 100: ¥88.521521 500: ¥83.510867 查看所有的价格 -	最小起订量: 1 最小包装量: 1	9 Weeks	Panel	面板安装	Polybutylene Terephthalate (PBT), Polyester, Glass Filled	PBT	Steel			未说明	Copper Alloy									Bulk				yes	活跃	1 (Unlimited)		IDC, Ribbon Cable		Receptacle, Female Sockets		25	125°C	-55°C		2					NO	YES	YES	NO	Signal	NO	GENERAL PURPOSE		25						2A										MULTIPLE MATING PARTS AVAILABLE			94V-0			NO								Housing/Shell (M3)							D-Sub											3 DB B										馈通										UL94 V-0			ROHS3 Compliant
DCMMD13H6PJ	ITT Cannon, LLC	数据表	N/A	-	最小起订量: 1 最小包装量: 1	通孔	Panel Mount, Through Hole, Right Angle	Polycyclohexylenedimethylene Terephthalate (PCT)	Polychlorinated	Steel	Steel, Yellow Chromate Plated Zinc									Copper Alloy		-55°C~150°C	Bulk	2015	24308-Style, Combo D®, D*MM	e4		活跃		13	Solder		Plug, Male Pins		13 (7 + 6 Power)			Black	2	Male				YES	NO	NO	NO	信号和电源	YES	GENERAL PURPOSE		13	直角					7.5A 40A			Gold							MULTIPLE MATING PARTS AVAILABLE			94V-0			NO				Pin				Mating Side, Female Screwlock (4-40)							D-Sub, Combo	1							7.5A		Machined	4 DC C - 13W6	6									Mounting Brackets, Shielded							50.0μin 1.27μm			UL94 V-0	无	无SVHC	Non-RoHS Compliant
180-026-213R021	NorComp Inc.	数据表	179 In Stock	1: ¥39.407133 10: ¥37.176542 100: ¥35.072205 500: ¥33.086990 查看所有的价格 -	最小起订量: 1 最小包装量: 1	14 Weeks	通孔	Panel Mount, Through Hole	Metal	Polybutylene Terephthalate (PBT)	PBT	Steel, Nickel Plated				Brass						-50°C~100°C	Tray	2009	180			活跃	不适用		Solder	EAR99	Receptacle, Female Sockets		26				3	Receptacle				NO	NO	NO	NO	Signal	NO	GENERAL PURPOSE	3A		26						5A			Gold		500V								94V-0	Black		NO								Board Side (4-40)					Nickel		D-Sub, High Density											2 DA A High Density										Shielded				9.93mm	39.2mm	12.6mm	Flash			UL94 V-0			ROHS3 Compliant	UL94 V-0	无铅
2758473	Phoenix Contact	数据表	31 In Stock	1: ¥374.017402 10: ¥352.846604 100: ¥332.874155 500: ¥314.032220 查看所有的价格 -	最小起订量: 1 最小包装量: 1	4 Weeks							未说明	未说明										Bulk	2010			yes	活跃	1 (Unlimited)		Solder				9				2					NO	NO	NO		Signal		GENERAL PURPOSE																																								D-Sub											1 DE E																							符合RoHS标准
L77TSBH25SOL2RM8	Amphenol ICC (Commercial Products)	数据表	13230 In Stock	1: ¥13.290236 10: ¥12.537959 100: ¥11.828263 500: ¥11.158738 查看所有的价格 -	最小起订量: 1 最小包装量: 1	5 Weeks	通孔	通孔	Thermoplastic, Glass Filled	Thermoplastic	Steel, Tin Plated			Copper Alloy	600V								-55°C~125°C	Tray	2004	TS			活跃	1 (Unlimited)		Solder		Receptacle, Female Sockets		25				2	Female								Signal			2.76mm		Straight				unknown	5A			Gold																					Mating Side, Female Screwlock (4-40)							D-Sub										Stamped	3 DB B										板锁					53.04mm		Flash			UL94 V-0			符合RoHS标准
MDM-25SCBR-F222	ITT Cannon, LLC	数据表	2641 In Stock	1: ¥2,695.063496 10: ¥2,542.512731 100: ¥2,398.596919 500: ¥2,262.827277 查看所有的价格 -	最小起订量: 1 最小包装量: 1	15 Weeks	通孔	Panel Mount, Through Hole, Right Angle	Liquid Crystal Polymer (LCP)	Polymer	Aluminum, Yellow Chromate Plated Cadmium									Copper Alloy		-55°C~200°C	Bulk	2006	83513-Style Micro D Metal Shell (MDM)		no	活跃	不适用		Solder		Receptacle, Female Sockets		25			Black	3	Female				NO	NO	NO	NO	Signal	NO	GENERAL PURPOSE		25						3A	YELLOW CHROMATE/CADMIUM		Gold													NO				Socket				Housing/Shell (Unthreaded)							D-Type, Micro-D											0.050 Pitch x 0.100 Row to Row										Shielded													Non-RoHS Compliant
09695117247	HARTING	数据表	71 In Stock	1: ¥83.665155 10: ¥78.929392 100: ¥74.461688 500: ¥70.246875 查看所有的价格 -	最小起订量: 1 最小包装量: 1	9 Weeks	Gold	Free Hanging, Panel	Free Hanging (In-Line)	Polyester Thermoplastic, Glass Filled	Polyester	Steel, Tin Plated									未说明	未说明	-55°C~125°C	Bulk				yes	活跃	1 (Unlimited)	17	焊杯		Plug, Male Pins		24 (17 + 7 Coax or Power)			Green	2	Male				NO	YES	NO	NO	Signal and Coax or Power (Not Included)	YES	GENERAL PURPOSE		24	Straight			14.3mm		5A										MULTIPLE MATING PARTS AVAILABLE			94V-0			YES						20 AWG		Housing/Shell (Unthreaded)							D-Sub, Combo	1										5 DD D - 24W7										接地凹痕					66.9mm	15.4mm				UL94 V-0			ROHS3 Compliant
684S9W4103L461	NorComp Inc.	数据表	67 In Stock	1: ¥166.525099 10: ¥157.099148 100: ¥148.206746 500: ¥139.817685 查看所有的价格 -	最小起订量: 1 最小包装量: 1	14 Weeks	Panel, Through Hole	Board Edge, Through Hole, Right Angle	Polybutylene Terephthalate (PBT)	PBT	Steel	Steel, Nickel Plated				Copper Alloy						-55°C~125°C	Tray	2011	Seal-D 684S		yes	活跃	1 (Unlimited)		Solder		Plug, Male Pins		9 (5 + 4 Power)			Black	2	Male								信号和电源			5A 40A				IP67 - Dust Tight, Waterproof				5A			Gold					9																Housing/Shell (4-40)					Nickel		D-Sub, Combo											3 DB B - 9W4	4	Insulated			0.402 (10.21mm)					Board Lock, Grounding Indents, Mounting Brackets							Flash			UL94 V-0		无SVHC	ROHS3 Compliant		无铅	Dust Tight, IP67, Waterproof
178-025-613R691	NorComp Inc.	数据表	183 In Stock	1: ¥80.015277 10: ¥75.486113 100: ¥71.213308 500: ¥67.182370 查看所有的价格 -	最小起订量: 1 最小包装量: 1	14 Weeks	Edge, Through Hole	Panel Mount, Through Hole, Right Angle	Steel	Polyamide (PA9T), Nylon 9T	Nylon	Steel, Nickel Plated				Brass						-55°C~105°C	Tray	2007	178	e4		活跃	不适用		Solder		Plug, Male Pins		25, 25			Black	2, 2	公对公								Signal										5A			Gold					25																Housing/Shell (4-40)					Nickel		D-Sub - Stacked	2									Stamped	3 DB B ; 3 DB B					0.318 (8.08mm)					Board Lock, Grounding Indents, Shielded							Flash			UL94 V-0			ROHS3 Compliant		无铅
XM3B-0922-112	Omron Electronics Inc-EMC Div	数据表	179 In Stock	-	最小起订量: 1 最小包装量: 1	12 Weeks	Gold, Tin	通孔	Panel Mount, Through Hole, Right Angle	Polybutylene Terephthalate (PBT), Glass Filled	Polybutylene	Steel, Nickel Plated									磷青铜	300V	-55°C~105°C	Tray	2001	XM3B	e3		活跃	1 (Unlimited)		Solder		Receptacle, Female Sockets		9			Black	2									Signal			2.74mm		直角			17.4mm		5A			Gold																					Mating Side, Female Screwlock (M2.6)							D-Sub	1										1 DE E							300V			Board Lock, Shielded					30.8mm		16.0μin 0.41μm			UL94 V-0			符合RoHS标准		无铅
09561625812	HARTING	数据表	171 In Stock	1: ¥36.221756 10: ¥34.171465 100: ¥32.237238 500: ¥30.412487 查看所有的价格 -	最小起订量: 1 最小包装量: 1	10 Weeks	Gold	通孔	Through Hole, Right Angle	Steel	Polybutylene Terephthalate (PBT), Polyester, Glass Filled	Polybutylene	Metal	Steel, Nickel Plated	Copper Alloy							-40°C~85°C	Bulk				yes	活跃	1 (Unlimited)		Solder	EAR99	Plug, Male Pins		15				3					NO	NO	NO	NO	Signal	NO	GENERAL PURPOSE		15	直角		2.286mm			2A		UL	Gold or Gold-Palladium			COMMERCIAL	3		STAGGERED		0.509 inch	Male	94V-0			NO	0.646 inch		2A		25mOhm		5000000000Ohm	Housing/Shell (4-40)	0.09 inch				Tin		D-Sub, High Density	1	2.54 mm							0.078 inch	Stamped	1 DE E High Density					0.350 (8.89mm)				1kV	Board Lock, Grounding Indents					31.3mm		30.0μin 0.76μm			UL94 V-0		无SVHC	ROHS3 Compliant
M83513/13-A01NP	Glenair	数据表	N/A	-	最小起订量: 1 最小包装量: 1	Gold Over Nickel	通孔	通孔	Aluminum			Aluminum		9	#2-56		HOLE.096	JACKPOST	EAR99	8536.69.80.00	Solder	1.27	直角	3	5000	8	-55	150	500	A	无	15.75	通孔	磷青铜	Aluminum	SKT	2	1.27(mm)	-55C to 150C	通孔	无	19.94 x 10.8 x 7.87mm	+150°C	-55.0°C	Compliant	未说明	0.787 inch	玻璃填充热塑性塑料	-55 °C	125 °C	无	M83513/13-A01NP	2	Cinch 连接解决方案	活跃	CINCH CONNECTIVITY SOLUTIONS	ONE	5.68			-55 to 150 °C			M83513	无	活跃			Solder		微型连接器	Micro D-Subminiature	9	150 °C	-55 °C		2	RCP	STANDARD: MIL-DTL-83513			YES	NO	NO	NO	NO	GENERAL PURPOSE	2.5400 mm	9	直角		2.54 mm	7.87mm	compliant	3(A)	NICKEL	MIL		通孔				2	9	STAGGERED	MULTIPLE MATING PARTS AVAILABLE	0.325 inch	SKT		NO	0.425 inch		3 A	RND PIN-SKT	8 mΩ		5000000000 Ω		0.05 inch	RECEPTACLE			SOLDER	化学镍	600VAC V		1	2.54 mm	500 Cycles	STAGGERED	2.78 N	0.139 N	0.043 inch	Non-Insulated	化学镍	S9P0	Connectors	直角	0.109 inch	19.94 mm	19.94	19.94mm	10.8mm	50u inch	7.87	符合RoHS标准