题目内容

判断以下语法表述的对错。If the action has been completed, the simple past is better. But if the action has not been completed, the past progressive is better.

A. 对
B. 错

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判断以下语法表述的对错。“We've been living here for ten years.”This sentence means the same as:“We've lived here for ten years.”

A. 对
B. 错

不论任何原因使通过回路的磁通量发生变化时，回路中产生的感应电动势与磁通量对时间的变化率成正比。

A. 对
B. 错

产生动生电动势的非静电力是洛伦兹力，产生感生电动势的非静电场力是涡旋电场力。

A. 对
B. 错

一对共轭调和函数的乘积仍为调和函数. ( )

A. 对
B. 错