问题 单项选择题

如图土样装在直径0.2m,测量长度0.8m的圆桶中,测得水头差0.2m,流量0.01m3/d,则渗流系数为()。

A.1.274m/d

B.0.2565m/d

C.0.3183m/d

D.0.6365m/d

答案

参考答案:A

解析:

 根据达西定律:

阅读理解

根据短文内容,回答下列问题。

     Most people like to eat sweets and ice-cream better than meat and rice. If we eat them after a meal,

they're not bad for us. But if we eat them before a meal, they may take away our appetite (食欲). It is

important for us to eat our meal regularly (有规律地) each day. When we feel worried or excited, we

may not want to eat.

    When a man is worrying about something, it is difficult for him to swallow (香) anything dry because

he has little appetite. Many years ago, some judges (法官) in England often gave a man some dry bread

to judge (判断) whether he was telling the truth. If the man could not swallow the bread, they thought he

was telling lies.

l. If we eat sweets and ice-cream after a meal, are they good for our health?

                                                                

2. If we eat sweets and ice-cream before a meal, what will happen?

                                                                

3. What do you think of the judges in England? Why?

                                                                

4. Do most people like to eat sweets and ice-cream better than meat and rice?

                                                                

5. Is it important for us to eat our meal regularly each day? 

                                                                

选择题