高压断路器液压操作机构应具有防止()的性能,并设置低液压()装置。
参考答案:失压慢分、闭锁
将1~7这七个数字,分别填入下面空格内,使等式成立.(每个数字只能用一次)
口×口=口÷口=口+口-口
______×______=______÷______=______+______-______.
Little Tom _____ finished his homework; otherwise, he wouldn't be listening to music.[ ]
A. can have
B. must have
C. should have
D. might have