题目内容

18. The number of articles published on smoking ________ amazing.

A. is
B. are
C. were
D. have been

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19. In that country, the rich ________ richer, the poor, poorer.

A. become
B. has become
C. becomes
D. is becoming

20. Three-fourths of the buildings ________ during the war.

A. was destroyed
B. is destroyed
C. were destroyed
D. has been destroyed

自动满足基尔霍夫第一定律的电路求解法是回路电流法。

A. 对
B. 错

当复杂电路的支路数较多、回路数较少时，应用电流法可以适当减少方程式数目。这种解题方法中，是以假想的电流为未知量，直接应用定律求解电路的方法。