在一个空的易拉罐底部打一个小洞，往罐里注满水，水从小洞射出。_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

在一个空的易拉罐底部打一个小洞，往罐里注满水，水从小洞射出。罐子在做如下哪种运动过程中，水将不从洞中射出( )

A．匀速上升

B．匀速下降

C．自由下落

D．竖直上抛运动

答案

CD

题目分析：在一个空的易拉罐底部打一个小洞，往罐里注满水，如果处于完全失重状态，即加速度大小等于g，方向竖直向下，则水不从洞中射出，而自由落体运动，竖直上抛运动都是加速度大小等于g，方向竖直向下的运动，所以CD正确；

填空题

用方框中所给词的适当形式填空，使短文回复完整。

flower, rest, feel, nothing, eat, health, wait, tell, say, many

This is the doctor’s waiting room. It is full of people. They are _小题1:___ to see the doctor. Mrs. Brown is小题2:______ the doctor something about herself. She says when she plants some _小题3:_____ in the garden. She has to sit down and ___小题4:____every five minutes, because she ____小题5:____ too tired. The doctor tells Mrs. Brown there is _小题6:____ much wrong with her after she looks her over 检查 carefully. She says Mrs. Brown _小题7:_____too much but she doesn’t take enough exercise. So the doctor __小题8:___, If you want to be __小题9:___, you must eat less food and take ___小题10:___ exercise.

判断题

叶缘可分为，全缘、锯齿缘、凹波缘等。