单项选择题
What does the man think of the last surprise party?A.Satisfactory.B.Unusual.###S
A.Satisfactory.
B.Unusual.
C.Disappointing.
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一台三相4极异步电动机PN=10 kW,UN=380 V,IN=19.8 A。定子绕组为星形接法,R1=0.5Ω。空载试验数据为:U0=380 V,I0=5.4 A,机械损耗pmec=80 W;堵转试验数据为:Uk=120 V,Ik=18.1A。忽略空载附加损耗,认为Xσ1=Xσ2,求该电动机的参数R、X、X、Rm和Xm。电动机的转速;
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单项选择题
Why is the woman in London?A.She is on holiday.B.She is on a business trip.###S
A.She
B.She
C.
C.She
D.She
E.
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