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（ 29 ）在 Internet 中，不需运行 IP 协议的设备是 A) 路由器 B) 集线器 C) 服务器 D) 工作站
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举一反三
【单选题】The main idea of the business school academic is appealing. In a world where companies must adapt to new technologies and source of competition, it is much harder than it used to be to offer good empl...
A.
had job security and opportunity of promotion
B.
had to compete with each other to keep his job
C.
had to undergo training all the time
D.
had no difficulty climbing the corporate ladder
【判断题】电气工具和用具应由专人保管，每六个月须由电气试验单位进行定期检查;使用前必须检查电线是否完好，有无接地线;坏的或绝缘不良的不准使用;使用时应按有关规定接好漏电保护器和接地线;使用中发生故障，须立即找电工修理。
A.
正确
B.
错误
【单选题】－Is it your boss in the office? －No, it _____ be him. He has gone to Beijing on business. [ ]
A.
mustn't
B.
shouldn't
C.
can't
D.
needn't
【简答题】使用电钻等电气工具时须（）。电气工具和用具应由专人保管，每（）个月须由电气试验单位进行定期检查。
【单选题】What is suggested about Business World Monthly?
A.
It pays its writers on a monthly basis.
B.
It holds an annual book fair for its readers.
C.
It has published several reviews written by Mr. Johnson.
D.
Its subscribers increased from the beginning of January.
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