什么是换辊周期？

房地产信托业务属于商业银行的资产业务。（）

三个小朋友，小红、小刚和小亮，他们同时到饭店吃饭，三人等候的时间分别为3分钟，8分钟和5分钟，怎样安排使三人等候的时间最短，最后一人等候了多少分钟？

根据句意，用括号内所给动词的适当形式填空。

1. Every year foreigners _______(come) to China to learn Chinese.

2. —why didn't you come and open the door for me, dear?

    —Oh, sorry, I _______(cook) in the chicken. I didn't hear you.

3. Some food _______(taste) good, but it is usually bad for our health.

4. Look! It's raining heavily. Why mot _______(take) a raincoat with you?

5. Dear Erie, your room is too dirty, It should _______(clean) right away.

6. The film _______(begin) by the time I got to the cinema.

7. —Keep quiet, kids, Dad _______(sleep) in the next room.

   —OK, Mum.

8. As teenagers, we're old enough _______(help) with housework We can help set the table,

   wash the dishes and clean our own rooms.

9. We know each other well because we _______(be) friends since tea years ago,

10. David preferred  _______(sell) newspapers to doing housework when he was young.

关于异丙托溴胺的描述，下列哪项正确：（）

A.作用机理与肾上腺素相似

B.作用机理与氨茶碱相似

C.可用于控制哮喘发作

D.可用于预防哮喘发作

E.吸入后维持作用时间较沙丁胺醇短

公有制的实现形式是指资产或资本的分配形式。( )