单项选择题

Usually, in an admission of athletes, female athletes go at the front of the procession, while male at therear part.
A、front
B、back 
C、left 
D、right

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问答题

三端集成芯片7815输出电压为

答案: A.15V
B.12V
C.-15V
D.5V
正确答案:15V
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