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【单选题】
在低压断路器的选用原则中，热脱扣器的整定电流( )所控制的负载的额定电流。A.
小于
B.
等于
C.
大于
D.
3倍于
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【单选题】For years scientists have been worried aboutthe ___________ of air pollution on the earth’s natural conditions.
A.
effect
B.
result
C.
account
D.
cause
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