题目内容

My grandmother was a very_________ person ，and she only spent money when she needed.

A. mething badly.
B. polite
C. economic
D. economical
E. patient

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Finally the soldiers threw back the enemy troops ______them from the rear.

A. pressing to
B. pressing for
C. pressing into
D. pressing on

在同一点短路时 Id(2) =1Id(3)。

在三相供电系统中,短路的基本类型有:1、2、3、4和5等。

短路电流的效应包括 1 和2 。