我国10kV电网,为提高(),一般采用中性点不接地的运行方式。
A、供电的可靠性
B、电能质量
C、电压质量
D、频率质量
参考答案:A
On hearing the news, the girl rushed out without hesitation, _____ the luggage _____ on the floor,
and _____ in the dark. [ ]
A. left, lied, disappeared
B. leaving, lying, disappeared
C. leaving, lie, disappearing
D. left, lay , disappeared
舵承可分上舵承及下舵承两种,上舵承由止推滚珠轴承和垂直滑动轴承组成,其中止推滚珠轴承是承受()
A.舵的重量
B.舵的侧向推力及摩擦力
C.舵机的转舵力矩
D.舵叶的反作用力