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【单选题】
A circuit breaker differs from a fuse in that a circuit breaker ______.A.
melts and must be replaced
B.
is enclosed in a tube of insulating material with metal ferrules(环) at each end
C.
gives no visual indication of having opened the circuit
D.
trips to break the circuit and may be reset
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举一反三
【单选题】John’s success has nothing to do with good luck. It’s years of hard work ______has made him what he is today.
A.
why
B.
when
C.
which
D.
that
【单选题】John's success has nothing to do with good luck. It is years of hard work ________ has made him what he is today. [ ]
A.
why
B.
when
C.
which
D.
that
【简答题】What has made Fern so sad at first?
【简答题】举例说明中式菜肴的特点?
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