问题
选择题
The police found the lost car ______. [ ]
A. with mistake
B. by accident
C. by mistake
D. in accident
答案
答案：B
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The police found the lost car ______. [ ]
A. with mistake
B. by accident
C. by mistake
D. in accident
答案：B
则f(x)在(0，π)内的正弦级数
的和函数在x=
处的值为（）。