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【简答题】
如图甲所示，是设计的“探究小球的重力势能大小与哪些因素有关“的实验装置． 其中AB是四分之一光滑圆弧轨道，BC是粗糙的水平面，木块初始静止在B点，让小球从距水平面高h处由静止释放，小球刚好能沿着过A点的切线方向进入圆弧轨轨道，然后与木块发生碰撞，木块运动一段距离后最终停下来．小球可认为是光滑的，如圈乙所示，是实验过程中的三个步骤其中小球质量m 1 ＜m 2 =m 3 ，小球由静止释放的位置距水平面的高度h 1 =h 2 ＜h 3 ． ①在小球由静止释放到即将与木块碰撞的过程中，小球的重力势能转化为小球的 ． ②通过观察 来比较小球的重力势能的大小． ③歩骤一、歩骤二是探究小球的重力势能大小与 关系． ④步骤二、步骤三是探究小球的重力势能大小与 的关系．
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【简答题】A．He wouldn't go because he didn't feel well. B．He wouldn't go because he didn't like Susan. C．He would go because that exercise might do him good. D．He would go though he was sick.
【单选题】—Why didn't you go swimming this afternoon? —Well, I didn't want to go alone, and no one______with me.
A.
went
B.
has gone
C.
would go
【单选题】She told us that she _____ with us if it rained. [ ]
A.
would not go
B.
didn't will go
C.
didn't go
D.
will go to
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