在交流输入电源中断的情况紧急时,可以通过断开()来延长UPS供电间
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队员静立接球,脚分前后时,只匀许以后脚做中枢脚进行旋转()
跳球时,不论球拍向哪个方向,执行裁判都要成为追踪裁判()
He fell asleep immediately last night; he must ________ (be) very tired.
A great number of small power stations ________ (set up) in their countysince liberation.