工作人员在60－110kV及以下电压等级中正常活动范围与带电设备的安全距离为（）米。

掌握好物质的性质、用途和化学用语是学好化学的基础，完成以下选择和填空：

（１）浓硫酸能使白纸变黑，是因为它有____[（１）－（４）填编号]

A．氧化性　B．吸水性　C．腐蚀性

（２）用一氧化碳冶炼铁，是利用它的____。

A．氧化性　B．还原性　C．可燃性

（３）可用作脱色制白糖的是______。

A．小苏打　B．熟石灰　C．活性炭

（４）可用作食品干燥剂的是____。

A． 石灰石　B．生石灰　C．纯碱

（5）用化学式表示3个锰酸酸离子_______。

（6）地壳中含量最多的非金属和氢元素组成物质的化学式______。

NetWare 网络操作系统提供了注册安全性，最大信任者权限屏蔽，目录与文件属性及

A．信任区域设置

B．用户信任者权限

C．协议安装属性

D．物理安全隔离

第二节 根据对话内容，从对话后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。

--Hi, Mike! How are you feeling?

--Hi, Jack !   61

--I was talking with Donna yesterday and she told me you had an accident.   62

--A drunk driver. He ran into my car from the rear.

--He must have hit you hard. Terrible!   63

--I was pretty shaken up at the time. Anyway, they brought me here.   64   I asked the doctor

whether there were any internal injuries. He said he didn' t think so, and that i needed to stay

here for a couple of days for observation.

--Well, Mike.   65  Let us know if there is something we can do for you,

--I'll do that. Thank you for your coming. And thanks for the flowers.

A．Don't worry about me!

B．Something wrong, I' m afraid.

C．Take it easy.

D．Nothing serious, I hope. E. But you don' t look too bad.

F. How did it happen?

G. How did you know?

A U. S. investor who purchases an option-free bond with a 7 percent coupon rate, maturing in 20 years, and issued by a U. S. -based company is most likely exposed to:()

A. volatility risk and credit risk.

B. event risk and interest rate risk.

C. volatility risk and yield curve risk.

服装设计中对服装的论述，其背景和基础就是“（）”。

A、服装与人体

B、服装与环境

C、环境和人体

D、以人为本