确定图3-3所示电路中各电流的初始值。换路前电路已处于稳态。

A. size
B. shape
C. appearance
D. effectiveness

A. We have developed industry at the expense of countryside
B. We have forgotten what our original countryside looked like.
C. People living On islands should protect natural resources for their survival
D. We should destroy all the built up areas

A. any
B. each
C. every
D. Some