设为取逆时针方向的圆周，则（） A． B． C． D． A.A B.B C. - 查题网

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河南成教 / 高等数学（工本）

设为取逆时针方向的圆周，则（）

A． B． C． D．

A.A

B.B

C.C

D.D

积分

高等数学（工本）

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