问题 填空题

2009年12月20日5时许,沪蓉高速枝江段一辆载有25吨左右液态氨的罐车发生侧翻,有少量液态氨泄漏,由于处理及时没有造成人员伤亡的环境污染.知识链接:高压液氨泄漏后立即汽化成有强烈刺鼻气味的氨气,对人的眼鼻黏膜有伤害,而且氨气有毒,还存在燃烧而引发爆炸的可能性,救援人员持高压水枪对不断泄漏的氨气进行稀释.试回答:

(1)救援人员用水稀释浓氨气,说明氨气具有什么物理性质?                                        .

(2)氨气对鼻黏膜的伤害,主要是氨气和黏膜上的水结合成了一种有腐蚀性的碱,该碱的名称是                   .

(3)有人提议:能否用酸去中和生成的碱?如果喷洒稀盐酸来处理该碱,所发生的中和反应的化学方程式是:                                                                 .有人马上反对:用盐酸不好!不好的原因是                                                                                 

答案

(1)易溶于水

(2)一水合氨

(3)NH3·H2O+HCl===NH4Cl+H2O;盐酸酸性强且易挥发造成污染

问答题 简答题
阅读理解

阅读理解。

     Spring is coming, and it is time for those about to graduate to look for jobs. Competition is tough, so

job seekers must carefully consider their personal choices. Whatever we are wearing,our family and friends may accept us, but the workplace may not.

    A high school newspaper editor said it is unfair for companies to discourage visible tattoos (纹身)nose

rings, or certain dress styles. It is true you can't judge a book by its cover, yet people do "cover"

themselves in order to convey (传递)certain messages. What we wear, including tattoos and nose rings, is an expression of who we are.

     Just as people convey messages about themselves with their appearances? so do companies. Dress

standards exist in the business world for a number of reasons, but the main concern is often about what

customers accept.

     Others may say how to dress is a matter of personal freedom, but for businesses it is more about

whether to make or lose money. Most employers do care about the personal appearances of their

employees (雇员),because those people represent the companies to their customers.

     As a hiring manager I am paid to choose the people who would make the best impression on our

customers. There are plenty of well-qualified candidates, so it is not wrong to reject someone who might

disappoint my customers. Even though I am open-minded, I can't expect all our customers are.

There is nobody to blame but yourself if your set of choices does not match that of your preferred

employer. No company should have to change to satisfy a candidate simply cause he or she is unwilling to respect its standards, as long as its standards are legal.

1. Which of the following is the newspaper editor' opinion according to Paragraph 2?

A. People's appearances carry messages about themselves.

B. Customers' choices influence dress standards in companies.

C. Candidates with tattoos or nose rings should be fairly treated.

D. Strange dress styles should not be encouraged in the workplace.

2. What can be inferred from the text?

A. Candidates have to wear what companies prefer for an interview.

B. What to wear is not a matter of personal choice for companies.

C. Companies sometimes have to change to respect their candidates.

D. Hiring managers make the best impression on their candidates.

3. Which of the following would be the best title for the text?

A. Employees Matter

B. Personal Choices Matter

C. Appearances Matter

D. Hiring Managers Matter

4. The author's attitude towards strange dress styles in the workplace may best be described as        .

A.enthusiastic

B. negative

C. positive

D. sympathetic