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【多选题】
一半径为R的光滑半球面固定平地面上,今使一质量为M的物块从球面顶点几乎无初速地滑下,如图所示.当物块所在球面处的半径与竖直方向的夹角为q 时,下列说法正确的是:A.
物块的切向加速度为
B.
物块的法向加速度为
C.
物块的法向加速度为
D.
物块的总加速度为
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【简答题】When we talk about how agers are getting worse and worse now, most young people don’t agree. agers always say they are growing up. They can have part-time jobs. And they can even drive a car. ...
【单选题】What went extinct and what lived in the deep ocean?
A.
coelacanth went extinct and the giant squid lived in the deep ocean.
B.
the giant squid went extinct and coelacanth lived in the deep ocean.
【单选题】You must not lose faith in humanity. Humanity is like an ocean;if a few drops of the ocean are dirty, the ocean does not become dirty.
A.
We cannot judge a person by his appearances so long as we have faith in humanity.
B.
Humanity is weak when there are some bad members.
C.
Though there are a few black sheep in our society, most people are not infected by them.
D.
However dirty the ocean may be, we can still swim in it.
【单选题】以下关于物理化学实验沸点仪的叙述错误的是( )。
A.
沸点仪中用回流冷凝的方法测定环己烷-乙醇体系的沸点和组成的。
B.
沸点仪中用来收集冷凝气相样品的球形空间应尽量小。
C.
沸点仪中冷凝管部分和圆底烧瓶部分应尽量靠近，但不能靠近到液相沸腾溅射范围内。
D.
沸点仪的基本设计思想是要尽量避免过热现象和分馏效应等引起的误差。
【单选题】What ocean did they have to go across?
A.
The South Atlantic Ocean.
B.
The North Atlantic Ocean.
C.
The East Pacific Ocean.
D.
The West Indian Ocean.
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