斯科特接线在一次侧,底线组VW和高绕组UO连成倒T形,其三个出线端接入电力系统的三相。二次绕组连成相位()°的V形。
A、60
B、180
C、90
D、120
参考答案:C
The children all turned__________the famous actress as she entered the classroom.
A.looked at
B.to look at
C.to looking at
D.look at
低压储液器仅在大型()制冷装置中使用。
A.氟利昂
B.水
C.氨
D.空气