1.How many shielding layers do coaxial cables commonly have?
1.同轴电缆通常有多少层屏蔽层？
2.Which analog telephone service is common historically in homes?
2.历史上家庭中常见的模拟电话服务是哪一种？
3.Multipair cables twist pairs at different rates primarily to:
3.多对电缆以不同的速率绞合的主要目的是：
4.Which instrument is used to detect dirt, scratches, or polish marks on fiber connector ends?
4.哪种仪器用于检测光纤连接器端面上的污垢、划痕或抛光痕迹？
5.Which statement about the 110 punch-down tool is true?
5.关于 110 压接工具的说法，哪一项是正确的？
6.Which is false about coaxial cable?
6.关于同轴电缆，以下哪项是错误的？
7.Which cable meets a backbone run needing four binder groups of 25 twisted pairs each?
7.哪种电缆符合需要四个线束组（每组 25 对双绞线）的骨干线路要求？
8.What is the usual vertical cable manager width for racks?
8.机架的常用垂直电缆管理器宽度是多少？
9.Max fibers supported by a single MPO connector?
9.单个 MPO 连接器支持的最大光纤数量是多少？
10.Where to install TMGB?
10.TMGB 应安装在哪里？
