三相感应电机直接起动瞬间,起动电流( ),起动转矩()。
A. 不大,很大
B. 很大,很小
C. 很大,很大
D. 很大,并不大
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_____________is the official language of the Chinese.
A(n)_____________is a unit of length equal to one-hundredth of a meter.
A(n)___________ is 2.54 centimeters.
One ________ is 12 inches (about 30 centimeters).