沉淀中若杂质含量太大，则应采用（）措施使沉淀纯净。

单词拼写。

1. The ____ opinion is that the local government should take action to help the blind people.

2.When you ____ blind people, they cannot tell if they  know you until you begin to speak.

3. The ____( 主要的) subjects in senior high schools are Chinese, English and mathematics.

4. The boy looked at me____( 好奇地) , as if I were a complete stranger.

5. Try to avoid being _____( 主观的) and one-sided when looking at problems.

下列各组文种中，()组同属于事务文书。

A.合同简报经济论文

B.简报合同会议纪要

C.计划总结调查报告

D.意见总结商业广告

男，20岁。苍白、乏力一周。淋巴结及脾大，白细胞计数32.0×10的9次方／L，骨髓中原始细胞占83％，过氧化物酶染色阴性。

最适宜的化疗方案是

A．DA方案

B．HA方案

C．HOAP方案

D．VDP方案

E．CHOP方案

试述周围性面神经麻痹和中枢性面神经麻痹的区别要点。

数据模型分为格式化模型与非格式化模型，层次模型与网状模型属于 【4】 。