问题 计算题

有一个圆柱形玻璃瓶,瓶身粗细均匀,瓶底很薄(瓶底厚度不计)。当在瓶内装有110g水时,用刻度尺测得水深是11cm。求:

(1)距瓶底6cm处水产生的压强是多大?(g取10N/Kg,水的密度为1.0×103kg/m3

(2)将瓶内的水倒净,换成96g某待测液体,待测液体在瓶内的深度为12cm。那么待测液体的密度是多少?

答案

解:

(1)距瓶底6cm处水产生的压强为:

(2)11cm深水的体积为

12cm待测液体的体积为

待测液体密度为

阅读理解

阅读理解。

     Imagine there is a bank that puts $86, 400 in your account (帐户) each morning. It carries over no

balance from day to day. Every evening the bank writes off (注销) the balance that you failed to use

during the day. What would you do? Take out every cent, of course !

     Each of us has such a bank. Its name is TIME.  Every morning, it puts in 86,400 seconds.  Every

evening it writes off, as it is lost. There is no balance or overdraft (透支). If you fail to use the day's

savings, the lost is yours. There is no going back. There is no taking from "tomorrow". You must make

good use of it so as to get more in health, happiness and success!

     The clock is running. Make the most of today. To realize the value of ONE YEAR, ask a student who

failed a grade; to realize the value of ONE MONTH, ask mother who gave birth to a premature(早产)

baby; to realize the value of ONE WEEK, ask the editor of a weekly newspaper; to realize the value of

ONE HOUR, ask the lovers who are waiting to meet; to realize the value of ONE MINUTE, ask a

person who missed the train; to realize the value of ONE SECOND, ask a person who just avoided

(避免) an accident.

     Make good use of every moment that you have. Remember that time waits for no one. Yesterday is

history. Tomorrow is a mystery. Today is a gift. That's why it's called "The Present".

1. The underlined word "balance" in Paragraph l means _____.

A. 平衡

B. 贷款

C. 余款

D. 提款

2. What is special about the TIME bank we each have?

A. We can store time in it whenever we like.

B. Someone puts $86,400 in it every day.

C. The time in it will surely get lost if you don't use it.

D. Someone helps you spend your time every night.

3. What can be the best title for the passage?

A. The Bank of Money

B. The Bank of Time

C. The Value of One Hour

D. The Clock Is Running

4. In this passage, the writer tries to tell us _____.

A. what a bank is

B. how to save money

C. the difference of time units

D. to make good use of time

选择题