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问题 单项选择题

某三角形网络LMN，其支路阻抗（ZLM、ZMZ、ZLN）均为Z，变换为星形网络LMN—O，其支路阻抗（ZLO、ZMO、ZNO）均为（）。

A.3Z

B.Z／3

C.Z

答案

参考答案：B

填空题

如图，已知△ABC中，∠A=40°剪去∠A后成四边形，则∠1+∠2=（    ）。
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单项选择题

Legislator: We should not waste any more of the taxpayers’ money on the government’s job-creation program. The unemployment rate in this country has actually risen since the program was begun, so the program has clearly been a failure.
Which of the following is an assumption on which the legislator’s argument depends

A．The budget of the job-creation program has typically increased every year.

B．The unemployment rate would not have risen even more than it has if the job-creation program had not been in existence.

C．The unemployment rate is higher now than at any time before the inception of the job-creation program.

D．If the job-creation program had been run more efficiently, it could have better served its purpose.

E．(E) Other government programs are no more effective in reducing unemployment than is the job-creation program.
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