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【多选题】
? [填空(1)] 和 [填空(2)] 的差称为转差。当三相异步电动机的转差率 S=1 时，电动机处于 [填空(3)] 状态，当 S 趋近于零时，电动机处于 [填空(4)] 状态。A.
电机转子转速
B.
旋转磁场的转速
C.
停止
D.
同步
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反馈参考答案：
举一反三
【单选题】Before the discovery of insulin, diabetic patients was treated by
A.
electric shock
B.
strict diets
C.
penicillin
D.
prontosil
【简答题】Only experts with a professional eve can tell the fine(fair,pleasant,subtle) distinction between the two gems.
【单选题】Which one is right for the patients with nonheritable retinoblastoma?
A.
The patients often have family history of retinoblastoma.
B.
The patients often get retinoblastoma before 8months.
C.
The patients can increased risk for other tumors.
D.
Mutations happen in germile.
【判断题】Before the discovery of insulin, diabetic patients was cured by strict diets.
A.
正确
B.
错误
【单选题】Before the patients recover from the anaesthetic, they often need an _____ to help them breathe.
A.
IV infusion
B.
oxygen mask
C.
ice pack
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