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

题型:选择题

问题:

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

考点:超重失重
题型:选择题

阅读短文,判断正( T)误 (F) 。

    Jack is a little boy.  He is eight years old.  He and his parents live in Washington,but his grandparents

live in New York,and it is very far(远的).  Today his paren ts are taking him to see them. So they are

going there by train. There are many people on the train. They are sitting on the seats(座位) , having a

chat or reading newspapers.  Jack is very happy, and he is running on the train.  His father says to him,

"Don't run. Sit down,please. ""I want to see my grandparents very much.  I want this train to go faster! "

Jack says.  All the people on the train laugh at him, but he doesn't know why.

1. Jack is _   _ years old.

A. six        

B. seven      

C. eight      

D. nine

2. Jack's grandparents live in           .

A. /          

B. NewYork    

C. Paris        

D. London

3. Jack is very _     .

A. sad        

B. happy      

C. tired        

D. hungry

4. Jack and his parents are going there by _    .

A. plane      

B. taxi        

C. bus        

D. train

5. Jack is            on the train.

A. running    

B. standing    

C. sitting      

D. jumping                   

题型:选择题

Directions: The question below is followed by six choices numbered 260-265. If a choice is correct, mark A in the space provided. If a choice is not correct, mark B. Blacken one circle on your answer sheet for each number.
The nurse is teaching an adolescent with inflammatory bowel disease about treatment with corticosteroids. Which adverse effects are concerns for this client

Adrenal suppression.

题型:选择题

现代科技将20984Po涂于飞机表面,可以吸收和屏蔽雷达波和红外线辐射,从而达到隐形目的。下面列出该原子核内中子数与核外电子数之差的数据正确的是                              

A.41

B.84

C.125 

D.209

题型:选择题

仪器车驾驶员不执行“三交一封”的,属于何种违章行为?

题型:选择题

终极的紧急关断系统分几级?

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