电机三相电流平衡试验时,试验电压通常取额定电压的( )。
A.3%~10%
B.15%~10%
C.15%~30%
D.30%~50%
参考答案:A
This is the most important gift _______ I have received from my parents.
A.whose
B.who
C.which
D.that
地下连续墙施工振动小、噪声低,非常适合在城市中施工。