Section B31.For the sake of our long-term (cooperate) __________, we may consider reducing the price by 10 per cent.
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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
异步电机直接启动时候的特点是启动电流大且启动转矩也很大。
A. 对
B. 错