如果向上移动装有额定载重量的轿厢所需的最大操作力不大于（）N，电梯驱动主机应装设手动紧急操作装置，以便借用平滑且无辐条的盘车手轮能将轿厢移动到一个层站
C
暂无解析
关于脐带脱垂下列概念正确的是: ()
_____ your timely advice,I would never have known how to go about the work.
John's score on the test is the highest in the class ; he____last night.
The first paragraph is intended to ________.
If you _____ in such a hurry,you _____ sugar into the sauce instead of salt.
Milk,butter,and cheese are ____ here from the farms.
We can hear （）from the back of the room.
You that letter to James. However ，yo didn't（）.
I am afraid it was a ____ for you to do this.
Even if his letter____tomorrow ， it____too late to do anything.