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【单选题】
一台绕线转子异步电动机，如果将其定子绕组短接，转子绕组接至频率为f1=50Hz的三相交流电源，在气隙中产生顺时针方向的旋转磁场，设转子的转速为n，那么转子的转向是( )。A.
顺时针
B.
不转
C.
逆时针
D.
不能确定
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【简答题】English into Chinese Picasso’s time in Madrid, however, came to a sudden end. At the beginning of June he contracted scarlet fever and had to return to Barcelona to get better. Hardly had he arrived, ...
【单选题】动脉血氧分压的描述错误的是
A.
正常值35～45mmHg
B.
正常值80～100mmHg
C.
是判断缺氧程度的指标
D.
小于60mmHg作为诊断呼吸衰竭的实验室指标
E.
60～80mmHg提示轻度缺氧
【单选题】The doctor warned his patient that ____ should he return to work until he had completely recovered
A.
on all accounts
B.
on no account
C.
in any time
D.
in no time
【单选题】Charlie had to return to his office for his handbag, ______he?
A.
hadn't
B.
didn't
C.
had
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