SL—2B缓蚀剂的投加浓度一般为（）。A、5~10mg/L B、10~15mg/L

阅读下面的短文，用括号内所给动词的适当形式填空，必要时可加助动词。

     You can never imagine what 1_____ (happen) next in your life. Here is a story about a shopping list.

     Mrs. Black was having a lot of trouble with her skin, so she went to see her doctor about it. He could not

find anything wrong with her, however, so he 2_____ (send) her to the local hospital for tests. The next

morning the doctor phoned 3_____ (tell) her the result and a list of things that he thought she should not eat,

as any of them might be the cause of her skin trouble.

     Mrs. Black carefully wrote all the things down on a piece of paper, which 4_____ (leave) beside the

telephone. Then she went out to have her hair 5_____ (cut).

     When she got back two hours later, she found her husband 6_____ (wait) for her and beside him　

7_____ (be) a big basket full of packages. Her husband said, "Hello, dear. I 8_____ (do) all your shopping

for you."

     "Done all my shopping?" She asked in surprise. "But how did you know what I 9_____ (want)?"

     "Well, when I got home, I found your shopping list beside the telephone," answered her husband," so I

went down to the shops and bought everything you 10_____ (write) down."

我们应该自觉地承担责任，做责任的主人，青少年要做到自觉承担责任，就必须（　　）

A．按照严格的标准要求别人与自己一起去承担责任

B．学会反思自己的责任，从而更好地承担责任

C．在父母和老师的监督下履行责任

D．积极和同学、朋友合作，共同承担责任

U会计师事务所指派A注册会计师担任X公司2009年度财务报表审计业务的项目负责人。在了解被审计单位及其环境、评估重大错报风险时，A注册会计师需要考虑以下问题，清代为做出正确的专业判断。

“观察和检查”是注册会计师了解被审计单位及其环境而必须执行的程序，它不仅可以提供有关被审计单位及其环境的信息，而且可以印证对管理层和其他相关人员的询问结果。实施的观察和检查程序包括( )。

A．将预期结果与被审计单位记录的金额、计算的比率、趋势进行比较

B．追踪交易在财务报告信息系统中的处理过程

C．检查文件、记录和内部控制手册，阅读管理层和治理层编制的报告

D．实地察看被审计单位的生产经营场所和设备

以下设备组中，完全属于计算机输出设备的一组是( )。

A．喷墨打印机、显示器、键盘

B．激光打印机、键盘、鼠标器

C．键盘、鼠标器、扫描仪

D．打印机、绘图仪、显示器

素数定理何时证明出来的（）。

A、1893年

B、1894年

C、1895年

D、1896年