炉子人口的密封方式一般用（）实现，炉子出口处可采用气帘或耐热的软质耐温材料。

急性心肌梗死的超急性期心电图改变是（）

A.ST段明显抬高

B.异常宽深的Q波

C.T波高耸

D.T波倒置

E.R波降低

短文改错（共10小题；每小题1分，满分10分）

Dear Ralph,

I'm a newcomer here of a small town. I would               1. _____

describe myself as shy and quietly. Before my classmates,     2. _____

it always seems difficult for me to do things well as        3. _____  

them. I'm sure they will laugh to me and see me as           4. _____

a fool. So I feel unhappy every day.                      5. _____ 

Besides, I have few friends. I don't know that they           6. _____

don't like to talk with me. Sometimes, we talked to each other  7. _____ 

very well in class, but after class we become stranger at      8. _____

once. I am trying to improve the situation since it doesn't     9. _____

seem to work. Can you tell me about what I should do?       10. _____

Yours,                        

Xiao Wei

临床见恶心、呕吐呃逆、嗳气等症频作，其病机是（）

A.痰浊上壅

B.肺气上逆

C.肝气上逆

D.胃气上逆

E.奔豚气逆

通常心电图机的基本结构不包括（）。

A.导联系统

B.心电放大器

C.描记系统

D.HRV分析

E.电源系统

简述服务定价的特点与定价的方法。