题目内容

30.__________impressed me most about the school is how it was designed to support both the students and thecommunity.

A)What
B)That
C)This
D)Which

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Section B31.For the sake of our long-term (cooperate) __________, we may consider reducing the price by 10 per cent.

33. Driving has long been thought of as (efficient)_________than flying, but according to new research,that is no longer the case.

设计在f1=50HZ电源上运行的三相感应电动机现改为在电压相同频率为60HZ的电网上，其电动机的（）。

A. Tst减小，Tmax减小，Ist增大
B. Tst减小，Tmax增大，Ist减小
C. Tst减小，Tmax减小，Ist减小
D. Tst增大，Tmax增大，Ist增大

异步电机直接启动时候的特点是启动电流大但是启动转矩不大

A. 对
B. 错