有色溶液对光的吸收程度与该溶液的什么因素有关？

阅读理解。

     In many countries, people can use their hands to eat chicken leg. But in some countries, people only

eat with their right hands. They never eat with left hands. They think it is bad table manners.

     In China, people mustn't point their chopsticks at anyone. Sometimes (有时) they can talk when they

eat. They can hold the bowl with their hands when eating noodles or rice. They can take vegetables from

the centre dishes. When they drink soup, they can drink it with their spoons or from their bowls.

     In England or America, people eat with knives and forks. But they mustn't wave (挥动) them during

a meal. They must use spoons to drink soup. Everyone should use a plate and finish the food on his plate.

But they can leave some on the dishes.   

1. In many countries, _____when they eat chicken leg.

A. people usually don't eat with their hands

B. people must use knives and forks

C. people eat with their hands

D. people can't use chopsticks

2. In some countries,it is bad table manners to _____.

A. eat with right hands

B. eat with spoons

C. eat with left hands

D. eat with forks

3. Chinese people _____ during a meal.

A. sometimes can talk with others

B. have to use plates

C. can't hold their bowls

D. mustn't use spoons to drink soup

4. In England or America, people _____ when they eat.

A. can't talk loudly and use their left hands

B. mustn't wave their knives and forks

C. use spoons, knives , chopsticks and forks

D. can drink soup from their bowls

5. Which sentence ISN'T right?

A. Chinese eat dinners with chopsticks.

B. People should use plates when eating dinners in England.

C. English can leave some food on the dishes.

D. Chinese shouldn't take vegetables from the centre dishes.

操作系统有两个重要的作用，一个是管理系统中的各种软硬件资源；另一个是向用户提供良好的______

将含a mol Na₂SO₃的溶液与含b mol Na₂S的溶液混合后，无明显现象；若再加稀硫酸，则立即出现黄色沉淀并有能使品红褪色的气体产生，则a与b的比值为[ ]

A．大于2

B．小于2

C．等于2

D．大于1/2

钻芯法检测建筑混凝土灌注桩基础，发现大部分混凝土芯样胶结较好，无松散、分层现象，但是芯样侧面存在蜂窝麻面、沟槽连续，该桩的桩身完整性可判定为（）。

A.Ⅰ类

B.Ⅱ类

C.Ⅲ类

D.Ⅳ类

数控折弯机后挡料有几种动作？用哪些参数控制？