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下列定积分为零的是________。

单选题
2021-07-24 14:17
A、<img src="https://learning.mhtall.com/upload/uc_course/10023/43D269C67F9120CA8C68714E0BC47872FD927777.png" alt="">
B、<img src="https://learning.mhtall.com/upload/uc_course/10023/FC83EF8CB0399BB3EF612742184DF1E0EC9D2E23.png" alt="">
C、<img src="https://learning.mhtall.com/upload/uc_course/10023/67A3319C4BE1F8573D8E51F71A55F5CE87857E79.png" alt="">
D、<img src="https://learning.mhtall.com/upload/uc_course/10023/C2081BB6BB0E05B56F29A0AA03E964D95F125C70.png" alt="">
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正确答案
A

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