相电压与线电压的一般关系为U相＝〖KF（〗3〖KF）〗U线。（）
参考答案：错
—How do you feel your travel to Hainan?
—________，I enjoyed it very much，although the weather of some days was unpleasant.
A．In addition
B．On the whole
C．In other words
D．On the other hand
灌注桩各工序应连续施工，钢筋笼放入泥浆后（）内必须浇筑混凝土。
A.2h
B.4h
C.6h
D.8h
