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【单选题】
设 为由分段光滑的曲线 所围成的闭区域,其面积为5,又 及 在 上有一阶连续偏导数,且 , ,则 ______________.A.
7;
B.
8;
C.
9;
D.
10.
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反馈参考答案：
举一反三
【简答题】Since it is to ask for sick leave, he often uses it as an excuse for staying away from school.
【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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