电动现象产生的基本原因是（）。 A.外电场或外压力的作用 B.电解质离子的作用 C.

企业发生的下列费用中，应计入管理费用的有()。

A．广告费

B．业务招待费

C．矿产资源补偿费

D．研究与开发费

阅读下列各小题，根据括号内的汉语提示，用句末括号内的英语单词完成句子。

1. — Can you come to my birthday party?

   — Sorry, I can't. I _________________. (得在家照料我奶奶). (have)

2. — Does he do exercise every day? -

    — Yes. It _________________ (跑步健身要花去他半小时) every morning, (take)

3. — Do you know anything about the singer?

    — Yes. I hear she _________________ (开始对唱外国歌曲感兴趣) at the age of six. (sing)

4. — Did you go to the movie last night?

    — Yes. But by the time I got there, the movie _________________ (开始十多分钟了). (for)

5. — I've waited here for a long time. It's too late.

    — Don't worry. You _________________ (直到有人叫到你, 才能离开). (until)

6. — What do you think of the hotel?

    — They _________________ (服务得够热情,使我们有宾至如归的感觉). (enough)

7. — Could you tell me _________________ (比赛是否因下雨而应该推迟)? ( put )

    — Sorry, I don't know.

PT100传感器是可变电阻器，随着温度的增加电阻器的阻值（）。0℃下电阻值为（）Ω。

Consider a bond that pays an annual coupon of 5% and that has three years remaining until maturity. Assume the term structure of interest rates is flat at 6%. If the term structure of interest rates does not change over the next twelve-month interval, the bond’s price change (as a percentage of par) will be closest to:

A．

B．

C．

中国电信集团应急物资调度分为跨省调度和省内调度二级。