整台电机一次更换半数以上的电刷之后,最好先以()的额定负载运行12h以上,使电刷有较好配合之后再满载运行。
参考答案:1/4~1/2
It's difficult to ______ the discussion with all this noise around us.
A.carry about
B.carry on
C.carry off
D.carry away
Fireworks中文本路径选择中文路径竖直方向是()
A.RotateArounPath
B.Vertical
C.SkewVertical
D.SkewHorizontal