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问题 多项选择题

基坑开挖应严格按照方案执行，宜采用分层开挖的方法，严格控制（），防止边坡和挖土机下的土体滑动，严禁超挖。

A.开挖面坡度

B.开挖土方量

C.分层厚度

D.分层层数

答案

参考答案：A, C

填空题

根据句意及首字母提示在横线处填上恰当的单词，使句子意思完整,语法正确。

1. I try my best to learn English well.  I don't want to let my parents d_______.

2. Dick is k ______ about geography.  He has read many books and travelled to many diifferent places

    around the world.

3. My best fricnd is very smart.  She can always come up w_______ some good ideas.

4. You need a lawyer to r______ you in court.

5. Have you carried the box to the s_______? It's dangerous here.

6. Only ten studcnts came to the class because dll the r_______ of the students were sick.
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计算题

如图所示,质量为3 m的足够长木板C静止在光滑水平面上,质量均为m的两个小物体A､B放在C的左端,A､B间相距s0,现同时对A､B施加水平向右的瞬时冲量而使之分别获得初速度v0和2v0,若A､B与C之间的动摩擦因数分别为μ和2μ,则

(1)最终A､B､C的共同速度为多大?

(2)求运动过程中A的最小速度?

(3)A与B最终相距多远?

(4)整个过程中A､B与木板C因摩擦所产生的热量之比为多大?
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