题目内容

阀用电磁铁主要用于（）场合，以实现自动控制。

A. 吸持钢铁零件的固定
B. 对电动机进行制动
C. 牵引或推持其它机械装置
D. 金属切削机床中远距离操作各种液压阀、气动阀

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You are given a PC, a router, and a cable. Select the correct combination that will allow you to log into the router locally using a terminal emulation program such as HyperTerminal.（）

A. Connect the PC's COM port to the router's console port using a straight-through cable.
B. Connect the PC's COM port to the router's console port using a rollover cable.
Connect the PC's COM port to the router's ethernet port using a straight-through cable.
D. Connect the PC's ethernet port to the router's ethernet port using a rollover cable.
E. Connect the PC's ethernet port to the router's ethernet port using a straight- through cable.

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