【判断题】图示板在力 F 作用下,带动圆盘沿水平面做纯滚动,设板与圆盘间无相对滑动,则作用在圆盘 A 、 B 两处的滑动摩擦力均不做功。
【单选题】I had a little trouble _____ English grammar. [ ]
【单选题】It is important for us ______ English well. [ ]
【简答题】Only years later _____ the truth about the matter. A) I learned B) did l learn C) I did learn D) had I learned
【单选题】单项选择。 Are you ready ping-pong? [ ]
【单选题】Do you have any trouble _______ English grammar? [ ]
【单选题】在数轴上到原点的距离等于8个单位长度的点所表示的数是 ( )
【单选题】腹部叩诊移动性浊音阳性时提示游离腹水量至少
【单选题】腹部叩诊移动性浊音阳性时提示游离腹水量至少