下列各项叙述中不正确的是哪一项()? A.反应物分子的一个原子或原子团被其他原子或原

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问题:

下列各项叙述中不正确的是哪一项()?

A.反应物分子的一个原子或原子团被其他原子或原子团取代的反应称取代反应

B.在羧酸、醛、酮、酯等分子中均含有结构

C.有机化合物中含-OH基的均属醇类化合物

D.乙醇和甲醚是同分异构体

考点:一级结构工程师基础知识普通化学普通化学题库
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想想如果你遇见下列短文中类似的情况时,你会怎样?

     A mother and her son got into a bus in a small city and sat down. The bus conductor came to them for

their money. The mother said, "I want one ticket to Oxford,"and gave him a shilling (先令, 1先令等于

12便士).

     The conductor looked at the small boy for a few seconds and then said to him, "How old are you, little

friend?"

     The mother began speaking, but the conductor stopped her, and the boy said, "I'm four years old at

home,and two and a half in buses and trains."

     The mother took six pence (便士) out of her bag and gave the money to the conductor.The conductor

gave her one and a half tickets.

1. One day the mother took a bus _____.

A. to a small city  

B. to get some money    

C. with her son    

D. to get a ticket

2. The mother gave the conductor _____ pence in all (总共) that day.

A. 12  

B. 16  

C. 10 

D. 18

3. The mother was _____.

A. not honest (诚实的)    

B. honest    

C. very clever    

D. not clever

4. _____ told him to say, "I'm four years old at home,and two and a half in buses and trains."

A. The conductor    

B. The boy's father    

C. The boy's mother   

D. The driver

5. The boy was really _____ years old.

A. four    

B. two    

C. two and a half    

D. six and a half

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2002年诺贝尔物理学奖中的一项,是奖励美国科学家贾科尼和日本科学家小柴晶俊发现了宇宙X射线源.X射线是一种高频电磁波,若X射线在真空中的波长为λ,以h表示普朗克常量,c表示真空的光速,以E和m分别表示X射线每个光子的能量和质量,则(  )

A.E=,m=0

B.E=,m=

C.E=,m=0

D.E=,m=

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女,32岁,今晨急速起床后突然腹痛难忍,来院就诊,其面色苍白,血压略下降,途中呕吐1次,右附件区触及一个5cm×6cm大小的囊性包块。

可能诊断为()

A.卵巢巧克力囊肿

B.黄体破裂

C.卵巢囊肿蒂扭转

D.输卵管痉挛

E.以上均不是

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党中央、国务院之所以三令五申严厉禁止和查处“形象工程”,主要是因为“形

象工程”

A.有损当地政府的威望,影响了中央权威

B.缺少透明度,容易导致腐败

C.劳民伤财,违背了为人民服务和对人民负责的原则

D.不利于政府职能的行使

题型:单项选择题

衣用纤维可分为()和化学纤维,其中化学纤维又包括再生纤维和()。

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