wg铁粉和铝粉的混合物,溶于足量盐酸后,加过量的NaOH溶液,过滤,将沉淀完全收

题型:选择题

问题:

wg铁粉和铝粉的混合物,溶于足量盐酸后,加过量的NaOH溶液,过滤,将沉淀完全收集后,充分加热,直至质量不再变化,称量仍为wg。原混合物中铝粉的质量分数是[ ]

A.30%

B.50%

C.70%

D.90%

考点:金属、非金属的有关计算
题型:选择题

根据短文内容判断正(T)误(F)。

     My name is Doris Miller. I'm a fourteen-year-old girl. I'm from London (伦敦). But now I'm in Beijing.

This is my school. It's No. 5 Middle School. My Chinese teacher's name is Li Tao. At school I have two

good friends. One is English, and the other is Chinese. My phone number is 88526230, and my e-mail

address (地址) is dorismiller@yahoo.com. I want to be your friend. You can call me or send (发送) an

e-mail to me.

( )1. Doris Miller is a Chinese girl and she is 14.

( )2. Doris is from Beijing.

(     )3. Her Chinese teacher is Li Tao.

( )4. Doris has two Chinese friends in her school.

( )5. You can call her or send an e-mail to her.

题型:选择题

诗作《帕斯捷尔纳克》的作者是()。

题型:选择题

--Wish you good luck in the exam.

--       .The same to you.

A.Me, too

B.See you

C.I'm sorry to hear that

D.Thank you

题型:选择题

下列地区中华侨和华裔分布最广的是[ ]

A.朝鲜半岛、日本群岛

B.印度半岛、西印度群岛

C.阿拉伯半岛、菲律宾群岛

D.中南半岛、马来群岛

题型:选择题

下列不属于投资估算必须达到的要求的选项是______。

A.工程内容和费用构成齐全,计算合理

B.选用指标与具体工程之间存在标准或者条件差异时,应进行必要的换算或者调整

C.估算的准确度应能满足建设项目决策分析与评价不同阶段的要求

D.满足工程设计招投标及城市建筑方案设计竞选的需要

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