搜索优化
English
搜索
Copilot
图片
视频
地图
资讯
购物
更多
航班
旅游
酒店
房地产
笔记本
Top stories
Sports
U.S.
Local
World
Science
Technology
Entertainment
Business
More
Politics
时间不限
过去 1 小时
过去 24 小时
过去 7 天
过去 30 天
按相关度排序
按时间排序
EDN电子技术设计
12 天
PCB上压接孔和过孔的孔径和公差要求相同,制造时有何影响
PCB中19.7mil的成品孔径包括压接孔和过孔。光绘中设计为双面阻焊覆盖的我司认为是过孔,但是所有的孔径公差都要求为+-2mil.这个公差要求太严,会导致加工时间变长和成本增加。
来自MSN
1 天
哇!键盘竟然这样好修,太神奇了!
上个月月末,和母上大人一起回老家参加表姐婚礼,没想到表姐夫也是个垃圾佬,骨灰级垃圾佬,真垃圾佬逛回收站捡垃圾,假垃圾佬只会在闲鱼内耗...正好公司电脑的键盘经历过N任主人现在有些键都不怎么回弹了,于是向他讨了个机械键盘,准备体验下回收站一手“垃圾”的 ...
一些您可能无法访问的结果已被隐去。
显示无法访问的结果
今日热点
Bryar found dead at 44
Trump warns BRICS nations
Cancels show due to injury
Launches bid for DNC chair
State of emergency in NY
To end cabin service earlier
Tapped as FBI director
Adani on US indictment
Israeli strike in Gaza
US Ambassador to France pick
Departs for Pacific visit
Teen killed by stray bullet
Little Rock mall shooting
Arctic blast in US
Ukraine seeks NATO invite
Joins editorial board
FIFA hosting bid report
Arms sale to Taiwan OK'd
Trudeau meets with Trump
Bears fire coach Eberflus
Outage at Philly airport
$28M Thanksgiving feast
Police: Man shot, killed
Returns to Stanford as GM
Chiefs clinch playoff berth
Canadian media outlets sue
Former Hartford mayor dies
Florida sheriff to lead DEA
5-year extension w/ Dodgers
Issues holiday scam warning
反馈