问题
多项选择题
复合电压元件由（）或门组成。
A、低电压；
B、零序电压；
C、负序电压；
D、过电压。
答案
参考答案：A, C
搜题请搜索小程序“爱下问搜题”
复合电压元件由（）或门组成。
A、低电压；
B、零序电压；
C、负序电压；
D、过电压。
参考答案：A, C
Please give kids a break. The request(要求) came after an online survey about 31 activities between classes. Some schools only 32 students to play in the corridors (走廊) during the ten-minute breaks, while 33 even make students do homework in the classroom. About this problem, different people have 34 ideas. 70% of parents in the survey said their children were not allowed to play 35 during breaks. Teachers should know children are 36 to be active, so education shouldn’t run 37 the laws(规律) of nature. “ It 38 that the playground is useless,” said one of the parents. Some parents agreed to 39 the school did. “ Games during breaks will make children too excited to listen to the teacher 40 in class.” Schools had their own reasons 41 this. Teachers were facing lots of responsibility(责任) over school 42 . Some schools stopped activities 43 children were injured （受伤）during breaks. 44 didn’t want to do so, but there was no better 45 to solve the problem.
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