问题
多项选择题
符合下列()条件时可以选用普通高效电动机。
A.负荷率在0.6以上,无频繁起动、制动
B.单机容量大
C.运行速度高
D.每年连续运行时间在3000h以上
答案
参考答案:A,B,D
符合下列()条件时可以选用普通高效电动机。
A.负荷率在0.6以上,无频繁起动、制动
B.单机容量大
C.运行速度高
D.每年连续运行时间在3000h以上
参考答案:A,B,D
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Everyone needs friends. We all like to 1 close to someone. It is nice to have a friend to talk, laugh and do things with. 2 , sometimes we need to be alone. We don't always want people 3 . But we would feel lonely if we never had a friend. No two people are 4 . Friends sometimes don't get on well. That doesn't mean 5 they no longer like each other. Most of the time they will make up (言归于好), and become 6 again. Sometimes friends move away. Then we feel very 7 . We miss them very much, but we can 8 them and write to them. It could be possible that we could even see them again. And we can also 9 new friends. There's more good news for people who have friends. They live longer than people who don't have. Why? It could be that they are 10 . Being happy helps you stay well and it could be good just knowing that someone cares about you.
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