不允许对加油站管控系统进行的操作是（）。A.修改屏幕背景 B.修改系统配置 C.重启

甲烷化反应器氮气升温准备工作有（）。

A．反应器进料加热器预热好，凝液流程畅通

B．确认反应器进料事故阀关闭

C．确认反应器进料前闸阀关闭

D．仪表完好

根据句意及首字母提示，在每句的空格内写上所缺单词的正确形式。

1. Great changes have t________ place in our country during the past ten years.

2. A j_______ high school is for students between 13 and 15 years old.

3. He is a manager of three different b_______.

4. He is a careless boy and he pays little a________ to his handwriting.

5. —Would you m_______ waiting a minute?  —Not at all.

6. He d_______ a lot of money to the poor though he was not rich.

7. Air, food and drink are necessary to s_______ life.

8. Let me i_______ myself. I'm a student of No. 1 Middle School.

9. The news appeared in the 1_______ newspapers.

10. When he was young, he received a good e________ at a very fine school.

传说（）已经开始铸造青铜器了，禹曾铸造（）以象征九州。

国有资产评估范围包括：（）。

A.固定资产

B.流动资产

C.无形资产

D.其他资产

下列口腔致癌因素中，哪项是危险性最大的癌症诱发物？（）

A.嚼槟榔

B.饮酒

C.烟草

D.光辐射

E.不良修复体