变压器的额定容量为2MVA,变压器阻抗电压百分数为5.5,基准容量取 100MVA,变压器的电抗标幺值为()。
A.2.75
B.0.36
C.0.03
D.0.27
参考答案:A
It was 300 hundred years ago _______ this historic temple was built by a wealthy Mandarin.
A.since
B.when
C.that
D.before
计算题:某三元注入站隔膜泵传动装置效率ηt=0.85,电动机功率裕度系数K=1,隔膜泵有效功率Pa=20kW,计算隔膜泵的配用功率是多少?选电动机的功率P。