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【判断题】
停电时的操作程序:先断开电源侧后断开负荷侧;先断开断路器后断开隔离开关。送电时,与上述操作程序相反。( )A.
正确
B.
错误
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【单选题】The old man __________ in Tibet for two years as a volunteer teacher；it is an experience he often mentions.
A.
served
B.
serves
C.
is serving
D.
has served
【单选题】-----Lin Tao’s spoken English is very good. ----- _______. He often talks with foreigners.
A.
So it is.
B.
So is it.
C.
So is he.
D.
So he is.
【简答题】酶的底物专一性(substratespecificity)(名词解释)
【简答题】底物专一性(substrate specificity)
【单选题】He often travels, but never takes the plane. He thinks it is ______ .
A.
comfortable
B.
dangerous
C.
effective
【简答题】阅读理解。 Mr. Turner likes fishing. It is his favorite sport. He often fishes for hours without catching anything. But this does not worry him. Some fishermen couldn't catch fish. Sometimes they catch old...
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