一台三相异步电动机的额定电压是220/380V,应使定子绕组为()联接才能使电动机的功率不变。
A. △/Y
B. Y/△
C. Y/Y
D. △/△
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More than 100 fire-fighters ________ Florida blaze on Monday.
A. fiddled with
B. helped with
C. collided with
D. struggled with
Amy didn’t see your car, so she ________ you’d gone out.
A. consumed
B. resumed
C. assumed
D. proclaimed
________ and the lecture began.
A. In the professor comes
B. In the professor comes
C. In came the professor
D. In comes the professor
He put his coat over the baby for fear that she ________ cold.
A. catches
B. caught
C. should catch
D. will catch
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