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【单选题】
感应电动机的功率因数( )。A.
总是滞后的
B.
总是超前的
C.
负载较小时超前
D.
负载较大时滞后
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A.
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B.
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C.
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D.
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【单选题】Man: My headache is terrible. Maybe I need more sleep. Woman: In fact, you need a hat and less sun. The sun is too bright. What’s the cause of the man’s headache?
A.
A terrible headache.
B.
Lack of sleep.
C.
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D.
Too much sun.
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【单选题】Sally, _____ your sunglasses. The sun is so bright.
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put on
B.
put up
C.
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