为了减少启动电流和保证启动转矩，绕线式感应电动机的启动方法采

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问题单项选择题

为了减少启动电流和保证启动转矩，绕线式感应电动机的启动方法采用( )。

A．转子串电抗器启动

B．定子串电阻或电抗器启动

C．定子串自耦变压器启动

D．转子串接电阻或频敏变阻器启动

答案

参考答案：D

单项选择题

Of the following signs and symptoms of bowel obstruction, which is related primarily to small bowel obstruction rather than large bowel obstruction

A. Profuse vomiting.
B. Cramping abdominal pain.
C. Abdominal distention.
D. High-pitched bowel sounds above the obstruction.

问答题简答题

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