主风机突然跳闸停机后,主风流量控制器设定值置于()位置。
A、锁位
B、最大
C、最小
D、无法确定
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
三相变压器容量的公式是(),其中U为相电压,I为相电流。
A.S=UI;
B.S=UIcosφ;
C.S=3UI;
D.S=UIsin。