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【单选题】
寄生虫的一生全部在宿主体内度过,它没有自由生活的阶段,一旦离开宿主,就不能生存。这种寄生称为( )。
A.
终身寄生
B.
阶段寄生
C.
暂时寄生
D.
假寄生
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【判断题】用按钮和接触器控制电动机正反向运转电路中，正转和反转按钮的动断触点从分断到闭合的时间要大于正转接触器线圈衔铁释放的时间。（ ）
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