创唯电子
创唯电子供应M39012/60-3001。Compare M39012/60-3001 price and availability by authorized and independent electronic component distributors.
库存查询
您现在的位置:IC代理商>代理品牌

缂傚倸鍊搁崐鎼佸磹閹间礁纾归柟闂寸绾惧湱绱掔€n偓绱╂繛宸簻鍥撮梺绯曟閺呮粓顢欓弮鍌滅=濞达絽澹婇崕鎰版煥濞戞瑦绀夐柕鍥ㄥ姍楠炴帡骞樼€涙﹩浠ч梻鍌欐祰濞夋洟宕抽敃鍌氱闁跨噦鎷�1闂傚倸鍊搁崐鎼佸磹妞嬪海鐭嗗〒姘e亾妤犵偛顦甸弫鎾绘偐閸愯弓鐢婚梻渚€娼чˇ顐﹀疾濞戞瑦鍎熷┑鐘叉处閻撴盯鎮橀悙棰濆殭闁告梹宀搁弻娑㈠Ω閵夈儮鍋撻崸妤冨祦闁哄秲鍔嶇紞鍥煕閹炬瀚禒褰掓⒑鐠囪尙绠扮紒缁樏玻鑳樄闁糕晝鍋ら獮瀣晜閽樺姹楅梻浣告啞閸旀ḿ浜稿▎鎾崇濞寸厧鐡ㄩ埛鎴犵磼鐎n偒鍎ラ柛搴㈠姍閺岀喎顫㈠畝濠傛濡炪倖娲忛崕闈涚暦閻旂⒈鏁嗛柛灞剧矌濡插洭姊绘担鍛婂暈婵炴彃绻樺畷婵堜沪閸撗屾锤婵°倧绲介崯顖炴偂閵夆晜鐓熼柡鍥╁仜閳ь剙婀遍埀顒佺啲閹凤拷闂傚倸鍊搁崐鎼佸磹妞嬪海鐭嗗〒姘e亾妤犵偞鐗犻、鏇㈡晝閳ь剛澹曡ぐ鎺撶厽闁绘梻鍘ф禍浼存煟閺傛寧顥炲ǎ鍥э躬椤㈡稑饪伴崨顓狀偧闂備礁鎲¢悷銉ф崲濮椻偓瀵鏁愭径濠勭杸濡炪倖甯婇悞锕傚磿閹剧粯鈷掑ù锝嗘灮妤犲繘鏌涙繝鍐疄鐎殿喖顭锋俊鎼佸煛閸屾矮绨介梻浣呵归張顒傜矙閹达富鏁傞柨鐕傛嫹2闂傚倸鍊搁崐鎼佸磹妞嬪海鐭嗗〒姘e亾妤犵偛顦甸弫鎾绘偐閸愯弓鐢婚梻渚€娼чˇ顐﹀疾濞戞瑦鍎熷┑鐘叉处閻撴盯鎮橀悙棰濆殭闁告梹宀搁弻娑㈠Ω閵夈儮鍋撻崸妤冨祦闁哄秲鍔嶇紞鍥煕閹炬瀚禒褰掓⒑鐠囪尙绠扮紒缁樏玻鑳樄闁糕晝鍋ら獮瀣晜閽樺姹楅梻浣告啞閸旀ḿ浜稿▎鎾崇濞寸厧鐡ㄩ埛鎴犵磼鐎n偒鍎ラ柛搴㈠姍閺岀喎顫㈠畝濠傛濡炪倖娲忛崕闈涚暦閻旂⒈鏁嗛柛灞剧矌濡插洭姊绘担鍛婂暈婵炴彃绻樺畷婵堜沪閸撗屾锤婵°倧绲介崯顖炴偂閵夆晜鐓熼柡鍥╁仜閳ь剙婀遍埀顒佺啲閹凤拷闂傚倸鍊搁崐鎼佸磹瀹勬噴褰掑炊閵娧呭骄闂佸壊鍋侀崕娲极鐎n剚鍠愮€广儱顦伴崑鈺呮煟閹寸姷鎽傞柡浣告閺屽秷顧侀柛鎾跺枎閿曘垺绗熼埀顒€顫忛搹瑙勫磯闁靛ǹ鍎查悵銏ゆ⒑閻熸澘娈╅柟鍑ゆ嫹10闂傚倸鍊搁崐鎼佸磹妞嬪海鐭嗗〒姘e亾妤犵偛顦甸弫鎾绘偐閸愯弓鐢婚梻渚€娼чˇ顐﹀疾濞戞瑦鍎熷┑鐘叉处閻撴盯鎮橀悙棰濆殭闁告梹宀搁弻娑㈠Ω閵夈儮鍋撻崸妤冨祦闁哄秲鍔嶇紞鍥煕閹炬瀚禒褰掓⒑鐠囪尙绠扮紒缁樏玻鑳樄闁糕晝鍋ら獮瀣晜閽樺姹楅梻浣告啞閸旀ḿ浜稿▎鎾崇濞寸厧鐡ㄩ埛鎴犵磼鐎n偒鍎ラ柛搴㈠姍閺岀喎顫㈠畝濠傛濡炪倖娲忛崕闈涚暦閻旂⒈鏁嗛柛灞剧矌濡插洭姊绘担鍛婂暈婵炴彃绻樺畷婵堜沪閸撗屾锤婵°倧绲介崯顖炴偂閵夆晜鐓熼柡鍥╁仜閳ь剙婀遍埀顒佺啲閹凤拷闂傚倸鍊搁崐鎼佸磹瀹勬噴褰掑炊閵娧呭骄闂佸壊鍋侀崕娲极鐎n剚鍠愮€广儱顦伴崑鈺呮煟閹寸姷鎽傞柡浣告閺屽秷顧侀柛鎾跺枎閿曘垺绗熼埀顒€顫忛搹瑙勫磯闁靛ǹ鍎查悵銏ゆ⒑閻熸澘娈╅柟鍑ゆ嫹2闂傚倸鍊搁崐鎼佸磹妞嬪海鐭嗗〒姘e亾妤犵偛顦甸弫鎾绘偐閸愯弓鐢婚梻渚€娼чˇ顐﹀疾濞戞瑦鍎熷┑鐘叉处閻撴盯鎮橀悙棰濆殭闁告梹宀搁弻娑㈠Ω閵夈儮鍋撻崸妤冨祦闁哄秲鍔嶇紞鍥煕閹炬瀚禒褰掓⒑鐠囪尙绠扮紒缁樏玻鑳樄闁糕晝鍋ら獮瀣晜閽樺姹楅梻浣告啞閸旀ḿ浜稿▎鎾崇濞寸厧鐡ㄩ埛鎴犵磼鐎n偒鍎ラ柛搴㈠姍閺岀喎顫㈠畝濠傛濡炪倖娲忛崕闈涚暦閻旂⒈鏁嗛柛灞剧矌濡插洭姊绘担鍛婂暈婵炴彃绻樺畷婵堜沪閸撗屾锤婵°倧绲介崯顖炴偂閵夆晜鐓熼柡鍥╁仜閳ь剙婀遍埀顒佺啲閹凤拷闂傚倸鍊搁崐鎼佸磹妞嬪海鐭嗗〒姘e亾妤犵偞鐗犻、鏇㈡晝閳ь剟鎮块鈧弻鏇熺箾閻愵剚鐝旂紒鐐劤濞硷繝寮婚悢铏圭<婵☆垱妞介崵瀣⒑閸忓吋绶叉繛纭风節瀵濡搁埡鍌氫簽闂佺ǹ鏈粙鎴︻敂閿燂拷5闂傚倸鍊搁崐鎼佸磹妞嬪海鐭嗗〒姘e亾妤犵偛顦甸弫鎾绘偐閸愯弓鐢婚梻渚€娼чˇ顐﹀疾濞戞瑦鍎熷┑鐘叉处閻撴盯鎮橀悙棰濆殭闁告梹宀搁弻娑㈠Ω閵夈儮鍋撻崸妤冨祦闁哄秲鍔嶇紞鍥煕閹炬瀚禒褰掓⒑鐠囪尙绠扮紒缁樏玻鑳樄闁糕晝鍋ら獮瀣晜閽樺姹楅梻浣告啞閸旀ḿ浜稿▎鎾崇濞寸厧鐡ㄩ埛鎴犵磼鐎n偒鍎ラ柛搴㈠姍閺岀喎顫㈠畝濠傛濡炪倖娲忛崕闈涚暦閻旂⒈鏁嗛柛灞剧矌濡插洭姊绘担鍛婂暈婵炴彃绻樺畷婵堜沪閸撗屾锤婵°倧绲介崯顖炴偂閵夆晜鐓熼柡鍥╁仜閳ь剙婀遍埀顒佺啲閹凤拷
搜索查看价格,货期,PDF,及最新库存

50个仓库,1500万条库存数据任选
  美国1号仓库    仓库直销,订单金额100元起订,满300元含运,满500元含税运,有单就有优惠,量大更优惠,支持原厂订货
型号 制造商 描述 实时库存 起订量 实时单价
(含税)
货期
(工作日)
操作
M39012-60-3001 Amphenol SV Microwave CONN SMA JACK STR 50OHM SOLDER42
1起订
1+
10+
25+
50+
100+
250+
¥269.2
¥219.42
¥269.2
¥190.25
¥178.91
¥169.73
6-10天购买 购买
,"cvcgetWeb":["c3JjPTEmUE49TTM5MDEyLTYwLTMwMDEtTkQ="],"cvcModel":["M39012-60-3001"],"cvcBrand":[" Amphenol SV Microwave "],"cvcNumberAll":["1,10,25,50,100,250,"],"cvcPriceAll":["269.2,219.42,269.2,190.25,178.91,169.73,"],"maxnum":["42"],"minnum":["1"],"mytime":["6-10天"],"haveiscanbuy":["yes"],

查看资料
  美国2号仓库    仓库直销,订单金额100元起订,满300元含运,满500元含税运,有单就有优惠,量大更优惠,支持原厂订货
型号 制造商 描述 实时库存 起订量 实时单价
(含税)
货期
(工作日)
操作
M39012/60-3001 Amphenol Corporation RF MIL Spec Connectors SMA F FlangMountConn 4 Hole (Solder Pot)104
1起订
1+
10+
25+
50+
100+
250+
¥248.07
¥208.24
¥191.93
¥191.81
¥188.5
¥160.97
6-10天购买 购买
,"cvcgetWeb":["c3JjPTMmUE49NTIzLU0zOTAxMi82MC0zMDAx"],"cvcModel":["M39012/60-3001"],"cvcBrand":[" Amphenol Corporation "],"cvcNumberAll":["1,10,25,50,100,250,"],"cvcPriceAll":["248.07,208.24,191.93,191.81,188.5,160.97,"],"maxnum":["104"],"minnum":["1"],"mytime":["6-10天"],"haveiscanbuy":["yes"],
M39012/60-3001 TE Connectivity RF MIL Spec Connectors SMA ST JCK 4HF REC0
1起订
1+
10+
25+
50+
¥366.37
¥320.87
¥307.04
¥270.88
6-10天询价 询价
1313000K05E-000 Delta Electronics Manufacturing Corp RF Connectors / Coaxial Connectors M39012/60-30010
100起订
100+
¥373.1
6-10天询价 询价
  美国3号仓库    仓库直销,订单金额100元起订,满300元含运,满500元含税运,有单就有优惠,量大更优惠,支持原厂订货
型号 制造商 描述 实时库存 起订量 实时单价
(含税)
货期
(工作日)
操作
M39012/60-3001 Amphenol Corporation SMA Female Flange Mount Connector, 4 Hole (Solder Pot) - Trays (Alt: M39012/60-3001)0
250起订
250+
500+
1000+
1500+
2000+
¥166.8
¥152.62
¥138.5
¥136.19
¥133.89
1-2周询价 询价
  美国6号仓库    仓库直销,订单金额100元起订,满300元含运,满500元含税运,有单就有优惠,量大更优惠,支持原厂订货
型号 制造商 描述 实时库存 起订量 实时单价
(含税)
货期
(工作日)
操作
M39012/60-3001 Delta Electronics Manufacturing Corp RF Connectors / Coaxial Connectors M39012/60-30010
1起订
1+
¥431.55
1-3周询价 询价
M39012/60-3001 Amphenol Corporation RF MIL Spec Connectors SMA F FlangMountConn 4 Hole (Solder Pot)0
1起订
1+
10+
25+
50+
100+
250+
500+
¥278.82
¥239.54
¥220.86
¥209.73
¥197.23
¥181.58
¥170.86
1-3周询价 询价
M39012/60-3001 TE Connectivity RF Connectors / Coaxial Connectors M39012/60-30010
1起订
1-3周询价 询价
  英国8号仓库    仓库直销,订单金额100元起订,满300元含运,满500元含税运,有单就有优惠,量大更优惠,支持原厂订货
型号 制造商 描述 实时库存 起订量 实时单价
(含税)
货期
(工作日)
操作
M39012/60-3001 Staffall RF SMA CONNECTOR, FEMALE, PANEL MOUNT, SOLDER TERMINAL, RECEPTACLE80
1起订
1+
37+
77+
¥567.02
¥481.97
¥453.62
1-3周购买 购买
,"cvcgetWeb":["c3JjPTI0JlBOPQ=="],"cvcModel":["M39012/60-3001"],"cvcBrand":[" Staffall "],"cvcNumberAll":["1,37,77,"],"cvcPriceAll":["567.02,481.97,453.62,"],"maxnum":["80"],"minnum":["1"],"mytime":["1-3周"],"haveiscanbuy":["yes"],
M39012/60-3001 RF SMA CONNECTOR, FEMALE, PANEL MOUNT, SOLDER TERMINAL, RECEPTACLE32
1起订
1+
7+
22+
¥246.87
¥219.44
¥202.98
1-3周购买 购买
,"cvcgetWeb":["c3JjPTI0JlBOPQ=="],"cvcModel":["M39012/60-3001"],"cvcBrand":[" "],"cvcNumberAll":["1,7,22,"],"cvcPriceAll":["246.87,219.44,202.98,"],"maxnum":["32"],"minnum":["1"],"mytime":["1-3周"],"haveiscanbuy":["yes"],
M39012/60-3001 Applied Engineering Products (AEP) RF SMA CONNECTOR, FEMALE, PANEL MOUNT, SOLDER TERMINAL, RECEPTACLE12
1起订
1+
2+
4+
¥274.3
¥182.87
¥137.15
1-3周购买 购买
,"cvcgetWeb":["c3JjPTI0JlBOPQ=="],"cvcModel":["M39012/60-3001"],"cvcBrand":[" Applied Engineering Products (AEP) "],"cvcNumberAll":["1,2,4,"],"cvcPriceAll":["274.3,182.87,137.15,"],"maxnum":["12"],"minnum":["1"],"mytime":["1-3周"],"haveiscanbuy":["yes"],
M39012/60-3001 Applied Engineering Products (AEP) RF SMA CONNECTOR, FEMALE, PANEL MOUNT, SOLDER TERMINAL, RECEPTACLE7
1起订
1+
2+
5+
¥411.45
¥384.02
¥365.73
1-3周购买 购买
,"cvcgetWeb":["c3JjPTI0JlBOPQ=="],"cvcModel":["M39012/60-3001"],"cvcBrand":[" Applied Engineering Products (AEP) "],"cvcNumberAll":["1,2,5,"],"cvcPriceAll":["411.45,384.02,365.73,"],"maxnum":["7"],"minnum":["1"],"mytime":["1-3周"],"haveiscanbuy":["yes"],
M39012/60-3001 Kings Electronics RF SMA CONNECTOR, FEMALE, PANEL MOUNT, SOLDER TERMINAL, RECEPTACLE4
1起订
1-3周询价 询价
M39012/60-3001相关搜索
  www.szcwdz.com    查看更多相关产品
参考图片 型号/品牌 描述 / 技术参考 操作
无图M39012/60-3001
Amphenol / SV Microwave
RF 连接器 SMA Straight Female Solder Pot
Rohs

PDF下载 
查价格库存
查看详细
  www.szcwdz.cn    查看更多相关产品
参考图片 型号/品牌 描述 / 技术参考 操作
无图M39012/60-3001
Amphenol / SV Microwave
RF 连接器 SMA Straight Female Solder Pot
Rohs

PDF下载 
查价格库存
查看详细
客服电话:400-900-3095
QQ:800152669
 缂傚倸鍊搁崐鎼佸磹閹间礁纾归柟闂寸绾惧湱绱掔€n偓绱╂繛宸簻鍥撮梺绯曟閺呮粓顢欓弮鍌滅=濞达絽澹婇崕鎰版煥濞戞瑦绀夐柕鍥ㄥ姍楠炴帡骞樼€涙﹩浠ч梻鍌欐祰濞夋洟宕抽敃鍌氱闁跨噦鎷�1闂傚倸鍊搁崐鎼佸磹妞嬪海鐭嗗〒姘e亾妤犵偛顦甸弫鎾绘偐閸愯弓鐢婚梻渚€娼чˇ顐﹀疾濞戞瑦鍎熷┑鐘叉处閻撴盯鎮橀悙棰濆殭闁告梹姘ㄧ槐鎺楁偐閸欏纭€闂佺懓寮堕幃鍌氼嚕椤曗偓瀹曠厧鈹戦崼銏℃瘒闂佽崵鍠愮划宀€绮旇ぐ鎺戠畺闁诡垎鈧弨浠嬫倵閿濆簼绨芥い锔垮嵆濮婃椽妫冨ù銊ョ秺瀹曟洟鎮ч崼銏㈠骄闂佸搫娲ㄩ崰鎾跺姬閳ь剟姊洪棃娑㈢崪缂佹彃澧藉☉鍨偅閸愨晝鍙嗛梺鍝勬祩娴滅偤鎮鹃悽鍛婄厱闁宠鍎虫禍鐐繆閻愵亜鈧牜鏁幒妤佹櫇闁靛/鈧崑鎾愁潩閻愵剙顏� 闂傚倸鍊搁崐鎼佸磹妞嬪海鐭嗗〒姘e亾妤犵偞鐗犻、鏇㈡晝閳ь剛澹曡ぐ鎺撶厽闁绘梻鍘ф禍浼存煟閺傛寧顥炲ǎ鍥э躬椤㈡稑饪伴崨顓狀偧闂備礁鎲¢悷銉ф崲濮椻偓瀵鏁愭径濠勭杸濡炪倖甯婇悞锕傚磿閹剧粯鈷掑ù锝嗘灮妤犲繘鏌涙繝鍐疄鐎殿喖顭锋俊鎼佸煛閸屾矮绨介梻浣呵归張顒傜矙閹达富鏁傞柨鐕傛嫹2闂傚倸鍊搁崐鎼佸磹妞嬪海鐭嗗〒姘e亾妤犵偛顦甸弫鎾绘偐閸愯弓鐢婚梻渚€娼чˇ顐﹀疾濞戞瑦鍎熷┑鐘叉处閻撴盯鎮橀悙棰濆殭闁告梹姘ㄧ槐鎺楁偐閸欏纭€闂佺懓寮堕幃鍌氼嚕椤曗偓瀹曠厧鈹戦崼銏℃瘒闂佽崵鍠愮划宀€绮旇ぐ鎺戠畺闁诡垎鈧弨浠嬫倵閿濆簼绨芥い锔垮嵆濮婃椽妫冨ù銊ョ秺瀹曟洟鎮ч崼銏㈠骄闂佸搫娲ㄩ崰鎾跺姬閳ь剟姊洪棃娑㈢崪缂佹彃澧藉☉鍨偅閸愨晝鍙嗛梺鍝勬祩娴滅偤鎮鹃悽鍛婄厱闁宠鍎虫禍鐐繆閻愵亜鈧牜鏁幒妤佹櫇闁靛/鈧崑鎾愁潩閻愵剙顏�
 闂傚倸鍊搁崐鎼佸磹瀹勬噴褰掑炊閵娧呭骄闂佸壊鍋侀崕娲极鐎n剚鍠愮€广儱顦伴崑鈺呮煟閹寸姷鎽傞柡浣告閺屽秷顧侀柛鎾跺枎閿曘垺绗熼埀顒€顫忛搹瑙勫磯闁靛ǹ鍎查悵銏ゆ⒑閻熸澘娈╅柟鍑ゆ嫹2闂傚倸鍊搁崐鎼佸磹妞嬪海鐭嗗〒姘e亾妤犵偛顦甸弫鎾绘偐閸愯弓鐢婚梻渚€娼чˇ顐﹀疾濞戞瑦鍎熷┑鐘叉处閻撴盯鎮橀悙棰濆殭闁告梹姘ㄧ槐鎺楁偐閸欏纭€闂佺懓寮堕幃鍌氼嚕椤曗偓瀹曠厧鈹戦崼銏℃瘒闂佽崵鍠愮划宀€绮旇ぐ鎺戠畺闁诡垎鈧弨浠嬫倵閿濆簼绨芥い锔垮嵆濮婃椽妫冨ù銊ョ秺瀹曟洟鎮ч崼銏㈠骄闂佸搫娲ㄩ崰鎾跺姬閳ь剟姊洪棃娑㈢崪缂佹彃澧藉☉鍨偅閸愨晝鍙嗛梺鍝勬祩娴滅偤鎮鹃悽鍛婄厱闁宠鍎虫禍鐐繆閻愵亜鈧牜鏁幒妤佹櫇闁靛/鈧崑鎾愁潩閻愵剙顏� 闂傚倸鍊搁崐鎼佸磹瀹勬噴褰掑炊閵娧呭骄闂佸壊鍋侀崕娲极鐎n剚鍠愮€广儱顦伴崑鈺呮煟閹寸姷鎽傞柡浣告閺屽秷顧侀柛鎾跺枎閿曘垺绗熼埀顒€顫忛搹瑙勫磯闁靛ǹ鍎查悵銏ゆ⒑閻熸澘娈╅柟鍑ゆ嫹10闂傚倸鍊搁崐鎼佸磹妞嬪海鐭嗗〒姘e亾妤犵偛顦甸弫鎾绘偐閸愯弓鐢婚梻渚€娼чˇ顐﹀疾濞戞瑦鍎熷┑鐘叉处閻撴盯鎮橀悙棰濆殭闁告梹姘ㄧ槐鎺楁偐閸欏纭€闂佺懓寮堕幃鍌氼嚕椤曗偓瀹曠厧鈹戦崼銏℃瘒闂佽崵鍠愮划宀€绮旇ぐ鎺戠畺闁诡垎鈧弨浠嬫倵閿濆簼绨芥い锔垮嵆濮婃椽妫冨ù銊ョ秺瀹曟洟鎮ч崼銏㈠骄闂佸搫娲ㄩ崰鎾跺姬閳ь剟姊洪棃娑㈢崪缂佹彃澧藉☉鍨偅閸愨晝鍙嗛梺鍝勬祩娴滅偤鎮鹃悽鍛婄厱闁宠鍎虫禍鐐繆閻愵亜鈧牜鏁幒妤佹櫇闁靛/鈧崑鎾愁潩閻愵剙顏�
 闂傚倸鍊搁崐鎼佸磹妞嬪海鐭嗗〒姘e亾妤犵偞鐗犻、鏇㈡晝閳ь剟鎮块鈧弻鏇熺箾閻愵剚鐝旂紒鐐劤濞硷繝寮婚悢铏圭<婵☆垱妞介崵瀣⒑閸忓吋绶叉繛纭风節瀵濡搁埡鍌氫簽闂佺ǹ鏈粙鎴︻敂閿燂拷5闂傚倸鍊搁崐鎼佸磹妞嬪海鐭嗗〒姘e亾妤犵偛顦甸弫鎾绘偐閸愯弓鐢婚梻渚€娼чˇ顐﹀疾濞戞瑦鍎熷┑鐘叉处閻撴盯鎮橀悙棰濆殭闁告梹姘ㄧ槐鎺楁偐閸欏纭€闂佺懓寮堕幃鍌氼嚕椤曗偓瀹曠厧鈹戦崼銏℃瘒闂佽崵鍠愮划宀€绮旇ぐ鎺戠畺闁诡垎鈧弨浠嬫倵閿濆簼绨芥い锔垮嵆濮婃椽妫冨ù銊ョ秺瀹曟洟鎮ч崼銏㈠骄闂佸搫娲ㄩ崰鎾跺姬閳ь剟姊洪棃娑㈢崪缂佹彃澧藉☉鍨偅閸愨晝鍙嗛梺鍝勬祩娴滅偤鎮鹃悽鍛婄厱闁宠鍎虫禍鐐繆閻愵亜鈧牜鏁幒妤佹櫇闁靛/鈧崑鎾愁潩閻愵剙顏�
库存查询
Copyright © 2013 深圳市创唯电子有限公司 All Right Reserved ICP备案证书号:粤ICP备11103613号
客服电话:400-900-3095 QQ:800152669 邮箱:sales@szcwdz.com 网址:www.szcwic.com 技术支持:创唯电子
深圳市市场监督管理局企业主体身份公示