各类电气设备上的注意事项，应有（）

用所给词的适当形式填空。

1. I think that he _____ (arrive) tomorrow.

2. Michael is a _____ (Canada) boy.

3. What about _____ (buy) a sandwich for him?

4. The _____ (child) parents have to make desks and chairs for them.

5. How _____ (surprise) when he saw his bag back.

6. An egg is much _____ (healthy) than a bag of potato chips.

7. Daniel introduced _____ (he) in the letter.

8. Let's _____ (help) him to make it successful.

9. My brother is _____ (interest) in basketball.

10. Do you think the man need _____ (see) a doctor?

企业家说，假如都按经济学家的观点经营，这些企业一半已经死掉了；而经济学家却说，不听经济学家的话，不是真正优秀的、能立于不败之地的企业家。这两种观点告诉我们

A．意识能够推动客观事物的发展

B．要做好量变的准备，促进事物的质变

C．要坚持两点论与重点论相结合的方法

D．要坚持矛盾普遍性与特殊性具体的历史的统一

_________ these arrangements, extra ambulances will be on duty until midnight.  [ ]

A. In search of

B. In addition to

C. In need of

D. In reply to

沥青基原油的特点是密度较大，轻馏分少，胶质和沥青质多，其特性因数K（）。

A.＞12.7

B.12.1～12.7

C.11.5～12.1

D.＜11.5

简述红细胞生成的调节。