下列热化学方程式书写正确的是[ ] A.2SO2+O2=2SO3; △H= -1

题型:选择题

问题:

下列热化学方程式书写正确的是[ ]

A.2SO2+O2=2SO3 ; △H= -196.6kJ/mol  

B.2H2(g)+O2(g)=2H2O(l) ; △H=-571.6kJ/mol

C.H2(g)+ 1/2O2(g)=H2O(l) ;  △H=-285.8kJ   

D.C(s)+O2(g)=CO2(g)  ;   △H=+393.5kJ/mol

考点:热化学方程式
题型:选择题

阅读理解。

     American schools' beginning is in September after a long summer holiday. There are two terms in a school

year. The first term is from September to January, and the second is from February to June. Most American

children begin to go to school when they are five years old. Most students are seventeen or eighteen years old

when they finish high school.

     High school students take only four or five subjects each term. They usually go to the same classes every

day, and they have homework for every class. After class they do many interesting things.

     After high school, many students go to college. They can go to a small one or a large one. They usually

have to give a lot of money. So many college students work after class to get the money for their studies.

1. How many terms are there in a school year in America?

A. Four

B. One

C. Three

D. Two

2. When does a summer holiday end (结束) in America?

A. In January

B. In September

C. In July

D. In June

3. When a child is ________ years old, he or she can go to school.

A. five

B. four

C. seven

D. six

4. How many subjects do the high school students take each term?

A. As many as they like.

B. Five.

C. Four.

D. Four or five.

5. Why do many college students have to work after class?

A. Because some work is helpful to their studies.

B. Because the teachers ask them to do so.

C. Because they like to work very much.

D. Because they need to get money for their studies.

题型:选择题

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本例应诊断为()

A.第一产程延长

B.头盆相对不称

C.胎儿生长受限

D.子宫收缩乏力

E.正常分娩经过

题型:选择题

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对该病人的护理措施中不正确的是()

A.尽量少食用含脂肪高的食物

B.保持大便通畅,必要时用弱酸溶液灌肠

C.避免使用麻醉、镇静剂

D.鼻饲饮食

E.注意水、电解质平衡,限制钠盐和钾盐摄入

题型:选择题

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