题目内容

Jenny_____Englisheveryevening.

A. hasstudy
B. studied
C. study
D. is studied

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Jenny _____in an office. Her parents _______in a hospital.

A. work, works
B. works, work
C. work, are working
D. is working, work

One of the boys _____ a black hat.

A. have
B. there is
C. there are
D. has

一台1000KV·A的变压器,功率因素为0.7,则它的输出功率为()

A. 300KW;
B. 500KW;
C. 700KW;
D. 1000KW

对于感性负载,提高功率因素的最常用的方法是()

A. 采用电容器和负载串联;
B. 采用电容器和负载并联;
C. 采用电阻和负载串联;
D. 采用电阻和负载并联;

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