题目内容

1._______who would like to go on the trip should put their names on the list.

A. Those
B. These
C. Somebody
D. The ones

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7. One of the of foreign travel is learning how to cope with the unexpected.

A. benefits
B. interests
C. profits
D. services

使10Ω负载电阻与1000Ω电源内阻相匹配的理想变压器的匝数比为( )。

A. 100
B. 10
C. 0.1
D. 0.01

对称三相四线制电路中,线电流为2A,则中线电流为( )A。

A. 6
B. 4
C. 2
D. 0

正弦交流电路中有功功率、无功功率、视在功率都守恒。( )