安全阀阀瓣在运行条件下开始升起的进口压力是使用()
A.排放压力
B.整定压力
C.超过压力
D.回座压力
参考答案:B
The one pleasure that Einstein()his great fame was the ability it gave him to help others.
A.resulted from
B.stirred up
C.turned out
D.derived from
计算题:已知一单相容量S1=100kVA;电压6000/230V;短路电抗Xd1=0.029Ω,另一台变压器容量S2=320kVA;电压6000/227V;短路电抗Xd2=0.0083Ω。试求当这两台变压器并联运行时的空载平衡电流和空载电流分别占这两台变压器额定电流的百分比(不计绕组电阻)。