试题与答案

L是半径为a,圆心在原点的上半圆周,则等于()。 A.A B.B C.C D.D

题型:单项选择题

题目:

L是半径为a,圆心在原点的上半圆周,则等于()。

A.A

B.B

C.C

D.D

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A

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