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问题 单项选择题

三个R=10Ω的电阻作三角形连接，已知线电流I1=22A，则该三相负载的有功功率P＝（）。

A、16.5 kW

B、14.5kW

C、8.38 kW

D、4.84kW

答案

参考答案：D

填空题

单词填空

1.A large q_____ of air-conditioners has been sold since the temperature is high.

2.It rained yesterday and as a c_____ the match was cancelled.

3.The prices of the dolls r_____ from $ 5 to $ 100.

4.We were really a_____ about you. You shouldn't have left home without a word.

5.I could hardly express my a_____ of your help.

6.The police _____(射击) at him, but he escaped.

7.What he said did not _____(惹恼) me , for I knew he did not mean it.

8.If Paul _____(辞职), who will get the job ?

9.He owes his success to his teacher's _____(鼓励).

10.It is our duty to help the _____(残疾).
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单项选择题

热加工车间的天车钢丝绳需要（）进行一次润滑。

A.一周

B.两周

C.三周

D.四周
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