有质量为24kg、体积为6×10-3 m3的贵重物体不慎掉入河里,一名潜水员下水

题型:计算题

问题:

有质量为24kg、体积为6×10-3 m3的贵重物体不慎掉入河里,一名潜水员下水去打捞它。(ρ=1.0×103kg/m3,g取10N/kg)求:

(1)物体的重力;

(2)物体的密度;

(3)物体浸没在水中受到的浮力;

(4)潜水员潜到水下5m深处时受到水的压强。

考点:重力的计算液体压强的计算浮力及阿基米德原理密度的计算
题型:计算题

One Sunday morning, I decided to buy a computer to use for school. I went to the biggest store in town, which sold all kinds of computers. There were so many computers there that I didn’t know how to choose a right one.

“Hi! What can I do for you?” A young man greeted me with a sweet smile. He looked like not a salesman but a student like me. I had a strange feeling—as if I had met him before. He began patiently showing me each model. With his help, I decided to buy one computer with enough functions at a very low price. I enjoyed this shopping experience because of his smile. A few months later, something was wrong with my computer. I went back to the store to have it fixed. When I arrived there, what I saw first was still his smile. As soon as I told him my problem, he comforted me immediately and tried his best to solve the problem for me. I was quite grateful to him for his sweet smile and good service (服务).

When I went back to school, his smile often appeared in my mind. I don’t know whether we’ll meet each other again, but his sweet smile will stay there in my memory and deep in my heart. Smiling is the most peaceful language in our life.

小题1: After reading the story, we can know that the writer is a _________.

A.student

B.salesman

C.doctor

D.reporter小题2: The underlined word grateful in the second paragraph means _________.

A.反感的

B.遗憾的

C.感激的

D.尊敬的小题3:The writer enjoyed the experience in the computer store because the young salesman ______.

A.helped him choose the cheapest computer

B.showed him how to use the computer correctly

C.helped him to buy a computer with enough functions

D.gave him his sweet smile and good service小题4:The best title for the passage is _________.

A.How to choose a right computer

B.How to use a computer correctly

C.The importance of smiling

D.The importance of computers

题型:计算题

中 * * 和解放军总部主动撤离延安是为了[ ]

A.拖垮敌人

B.寻找歼灭敌人的时机

C.避免与国民党军队的正面交锋

D.实现战略上的进攻部署

题型:计算题

打造文明河南的要求是什么?

题型:计算题

用于凝结水处理的混合床所用的树脂可选择弱酸及弱碱离子交换树脂。()

题型:计算题

“一带一路”建设中,要加强()等沿海城市港口建设。

A、上海

B、三亚

C、广州

D、天津

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