将铁粉和铜粉的混合物7g,加入到盛有58.1g稀盐酸的烧杯中,恰好完全反应。 此

题型:计算题

问题:

将铁粉和铜粉的混合物7g,加入到盛有58.1g稀盐酸的烧杯中,恰好完全反应。

此时烧杯内各物质的总质量为64.9 g。试计算:

(1)原混合物中铁粉的质量分数。(1分)

(2)反应后所得溶液中溶质的质量分数。(保留一位小数)(2分)

考点:化学反应方程式的计算
题型:计算题

业主将建设工程项目的设计、设备与材料采购、施工任务全部发包给一个承包商的工程承包合同是()。

A.EPC承包合同

B.施工总承包合同

C.单项工程承包合同

D.特殊专业工程承包合同

题型:计算题

青年男性,发热2天,体温37.8~39.1℃,腰部胀痛,尿频、尿急,解黄色稀便1次,无咳嗽咳痰,此患者最可能的诊断为()

A.急性肠炎

B.伤寒

C.大叶性肺炎

D.疟疾

E.急性。肾盂肾炎

题型:计算题

Are you going to high school to go on with your study What will you do if you can’t Don’t worry. Vocational schools are open for you because our country is in need of people with special skills.

Compared with common high schools, vocational schools have more advantages. Firstly, in order to promote the development of vocational education, our country spends a lot of money on it. So you need to pay only a smaller half of the school fee. Secondly, in here you have already started learning practical skills that you can use all your life. But some other students may still worry about how to spend the long three years at high schools. Why Because they didn’t choose the school that suits them. And finally, when they are still wondering where to go, you are already able to live on your own hands proudly. And perhaps it won’t be long before you are on the road to success.

People take different roads because they have different potentials. So different students should choose different schools. Go to high school if you think that you can go farther on that road. Choose a key high school if you are lucky enough to have the chance. Enter a vocational school if you are interested in the lessons there and you are better at making things with your hands.

In a word, think carefully and see what kind of person you are. Remember, always choose things that suit you.

This passage is written to ().

A.advise some students to choose vocational schools

B.talk about the advantages of common high schools

C.discuss how to divide students into different groups

D.compare different schools

题型:计算题

选择软件开发工具时,应考虑功能、()、稳健性、硬件要求和性能、服务和支持。

A.易用性

B.易维护性

C.可移植性

D.可扩充性

题型:计算题

净室方法未广泛使用的原因有哪些?

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