当电梯下行速度超过_额定速度时,达到限速器设定速度后,限速器开始动作
参考答案:115%
— Can you keep an eye on my bag? I just want to use the bathroom.
— _____ It'll be safe with me.[ ]
A. Sure, why not?
B. Take it easy
C. Go ahead.
D. Not at all.
一棵二叉树第六层(根结点为第一层)的结点数最多为【 】个。