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【单选题】
关于感应电机调速下面正确的是()A.
绕线式转子可以采用转子串电阻调速
B.
基频以下变频调速时电压与频率成反比变化
C.
变极调速可以实现无级调速
D.
变频调速时最大转矩保持不变
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举一反三
【单选题】E There were smiling children all the way. Charily they knew at what time the train passed their homes and they made it their business to stand along the railway, wave to complete strangers and cheer ...
A.
adventurou s
B.
pleasant
C.
exciting
D.
dull
【单选题】I knew the train had stopped, but I had the________ that it was moving backwards.
A.
desire
B.
dream
C.
worry
D.
sensation
【简答题】旋毛形线虫的成虫主要寄生于猪()。 A肺脏 B小肠 C肝脏 D心肌
【简答题】A There were smiling children all the way. Charily they knew at what time the train passed their homes and they made it their business to stand along the railway, wave to complete strangers and cheer ...
【简答题】旋毛形线虫的成虫主要寄生在人体的( )内。
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