下列关于有机物的叙述正确的是( ) A.三氯甲烷可以做麻醉剂,它和四氯化碳都是重

题型:选择题

问题:

下列关于有机物的叙述正确的是(  )

A.三氯甲烷可以做麻醉剂,它和四氯化碳都是重要的有机溶剂

B.石油液化气、天然气、脂肪和石蜡的主要成分都是碳氢化合物

C.由CH2=CHCOOCH3合成的聚合物为

D.能与NaOH溶液反应且分子式为C2H4O2的有机物一定是乙酸

考点:卤代烃酯化反应加聚反应缩聚反应有机物的推断
题型:选择题

阅读理解。

     Waste can be seen everywhere in the school. Some students ask for more food than they

can eat and others often forget to turn off the lights when they leave the classroom.

     They say they can afford these things. But I don't agree with them. Waste can bring a lot of

problems. Although China is rich in some resources(资源) , we are short of (缺乏) others, for

example, fresh water. It is reported that we will have no coal(煤) or oil to use in 100 years.

So if we go on wasting our resources, what can we use in the future and where can we move?

Think about it. I think we should say no to the students who waste things every day. Everybody

should stop wasting as soon as possible.

     In our everyday life, we can do many things to prevent waste from happening, for example,

turn off the water taps(水龙头) when we finish washing, turn off the lights when we leave the

classroom, try not to order more food than we need, and so on. Little by little, everything

will be changed. Waste can be stopped one day, if we do our best.      

1. From the passage we know that some students often _____ in the school.  

A. eat too much    

B. don't work hard

C. waste things    

D. throw rubbish everywhere

2. Which is not mentioned in this passage?   

A. Fresh water.  

B. Forest.

C. Oil.        

D. Coal.

3. Which of the following is right?

A. Waste brings problems.  

B. Waste can bring no problem.   

C. China is rich in fresh water.  

D. Students never waste things.

4. Which is the best title of this passage?

A. Stop Wasting  

B. School life  

C. Waste in the School  

D. Rich Resources in China

题型:选择题
口算我最行。
900÷9=360÷6=440÷4=
35×20=52×40=60×13=
7.6-5.3=2.7+3.5=4.8+2.6=
题型:选择题

患者男,35岁,吸烟史15年,主诉右下肢麻木、发凉、间歇性跛行8年,以下尤为重要的措施是()

A.使用抗生素

B.使用激素

C.使用免疫抑制剂

D.嘱患者防止受寒

E.嘱患者戒烟

题型:选择题

钢与混凝土组合梁的设计规定,下列哪一条不完全符合《钢结构规范》的要求?()

A.钢与混凝土组合梁一般用于不直接承受动力荷载的简支组合梁及连续组合梁

B.钢与混凝土组合梁的承载力可采用塑性分析方法进行计算;当钢梁中受压板件的宽厚比不符合塑性设计要求时,则应采用弹性分析方法计算

C.钢与混凝土组合梁的挠度应按弹性方法进行计算,但应考虑混凝土翼板和钢梁之间的滑移效应对组合梁的抗弯刚度进行折减

D.钢与混凝土组合梁的翼板可用现浇钢筋混凝土板,也可采用压型钢板钢筋混凝土组合板,但不宜采用混凝土叠合板

题型:选择题

认真阅读给定资料,概述“我国县域经济发展的现状”。要求:①分析恰当,条理清楚,语言通畅。②答案写在卡上的指定位置(做答在其他位置上的一律无效)。③字数不多于800字。

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