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【单选题】
闭区域 是由简单的闭曲线 (正向)所围,下列积分不等于 面积的积分是( ).A.
;
B.
;
C.
;
D.
.
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反馈参考答案：
举一反三
【单选题】_____ that he isn’t adequate to the present job, he devotes all his spare time to studying professional knowledge.
A.
Concern
B.
To concern
C.
Concerned
D.
Concerning
【单选题】—Michael has a temperature, so he isn’t able to come. —____
A.
I’m sorry to hear that.
B.
Take it easy.
C.
Good luck.
【单选题】What is the man's problem?
A.
His roommate is noisy.
B.
He isn’t speaking to his roommate.
C.
He does not like his roommate.
D.
He doesn’t know his roommate very well.
【单选题】—Michael has a temperature, so he isn’t able to come. —____
A.
I’m sorry to hear that.
B.
I’m disappointed.
C.
Good luck.
D.
Take it easy.
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