建筑排水系统中设置通气管系统的作用不包括（）。A．防止管道内压力波动过大，以保护水封

读短文，选择正确答案。

     Mr. Brown lives in a nice house in a small town with his wife (妻子), Mrs. Brown. From Monday to

Friday he works in an office near his house. He is free on Saturdays and Sundays. He has a nice garden beside

his house. He likes growing flowers and he often works in the garden on Saturdays and Sundays. The flowers

are very beautiful and Mrs. Brown likes them very much. She often helps Mr. Brown.

1. Mr. Brown lives in _____________ with his wife.

A. a city

B. a small town

C. a big town

2. He works _____________ days a week in his office.

A. four

B. five

C. six

3. He isn't _____________ on Saturdays and Sundays.

A. free

B. busy

C. happy

4. He likes _____________ on Saturdays and Sundays.

A. working in his garden

B. walking in his garden

C. looking at his garden

5. Mrs. Brown _____________ the flowers.

A. likes

B. doesn't like

C. often helps

哪项与新生儿肺透明膜病的病理生理有关（）

A.肺内淋巴管和静脉运转体液功能不完善

B.肺泡表面活性物质缺乏，表面张力增加，呼气时肺泡萎陷

C.气体交换减少，产生缺氧、酸中毒和肺血管痉挛使青紫加重

D.肺组织缺氧，毛细血管和肺泡壁渗透性增高，液体外漏

E.血浆纤维蛋白渗入肺泡，形成嗜伊红透明膜，更阻碍了换气

马斯洛认为五个需要层次理论又可分为缺失需要和生长需要。

病毒粒子的脂质，主要存在于（）中。

A.衣壳

B.囊膜

C.核衣壳

D.外壳

混合信道分配（HCA）方案包括（）两个部分。

A.信道隔离、信道合并

B.部分信道隔离、部分信道共享

C.信道分享、信道隔离

D.信道选择、信道合并