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【判断题】
串级调速就是利用一个或n个辅助电机或者电子设备串联在绕线式异步电动机转子回路里,把原来损失在外串电阻的那部分能量加以利用,或者回收到电网里,既能达到调速的目的,又能提高电动机运行效率,这种调速方法叫串级调速。
A.
正确
B.
错误
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举一反三
【简答题】Most parents forbid their children to speak to ______ .(strange)
【单选题】It is most important that the children be ________ in the knowledge that they are loved.
A.
secure
B.
conscious
C.
reliable
D.
alert
【单选题】____ children tend to prefer sweets to meat.
A.
The most
B.
Most
C.
Most of
D.
The most of the
【判断题】烧结粘土砖烧制得越密实,则其质量越好。(    )
A.
正确
B.
错误
【判断题】Most children attend kindergarten when they are 4 in America.()
A.
正确
B.
错误
【单选题】洗脱洗脱操作不能改变的的是( )。
A.
样品中组分的个数
B.
分离效果
C.
分析速度
D.
系统压力
【简答题】Most children enjoy listening to it.
【简答题】However, most children are 2           ( face ) with a completely different situation. Most parents fear that s will pr children from increasing new knowledge and 3 the children will fail in ...
【判断题】烧结粘土砖烧制得越密实,则其质量越好。
A.
正确
B.
错误
【简答题】Where were the children most of the time?
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