由铜片、锌片和100mL稀硫酸溶液组成的原电池中,当铜片上产生2.24L(标准状

题型:问答题

问题:

由铜片、锌片和100mL稀硫酸溶液组成的原电池中,当铜片上产生2.24L(标准状况)气体时,此时溶液中硫酸的物质的量浓度为1mol/L,试计算:

(1)锌片质量减轻了多少克?

(2)原稀硫酸溶液的物质的量浓度是多少?

考点:化学反应方程式原电池原理电解池原理
题型:问答题
根据图片,选择正确的句子。
( ) 1. A. This suitcase is mine.   
B. This camera is mine. 
( ) 2.

A. What's his favorite game?  Football.   
B. What's his favorite game?  Baskethall.

( ) 3. A. Lily wanted to go to the concert.
B. Lily wanted to read a book.
( ) 4. A. What will he do?  He will play the drums. 
B. What will he do?  He will play the guitar.
( ) 5. A. When's your birthday?  On October 1st. 
B. When's your birthday?  On June 2nd.                                                                   
题型:问答题

It's over three years since I began to learn English. I am glad that I am getting on well with it.  I find English very interesting, but quite difficult. When I first started, I thought I had only to remember the new words and learn some grammar. I know little about English idioms(习语). I thought each English word had a word with the same meaning in Chinese. When I learned to say "I see a book on the desk", I thought the English word "see" was just like the Chinese word "kan". So one day when my teacher asked me, "What are you doing?" I answered, "I'm seeing a book." "That's wrong," the teacher said. "You don't see a book. You read a book. You can't use an English word like a Chinese one. Be sure not to make the same mistake again." 

After that I began to pay more attention to the differences between Chinese and English. For example, in English we say a "high mountain", but a "tall man". In Chinese we use the same word "gao" for both. Again in English we say "take part in the sports meeting", "attend a meeting" and "join the army", while in Chinese we can use "can jia" for all the three. It's interesting, isn't it? So to study English doesn't only mean hard work, it can be great fun, too! We not only have to pay attention to pronunciation, grammar, spelling and handwriting, we also have to understand English idioms. We can learn English well only in that way!

But all this is only a beginning and I still have a long way to go. I'll try my best and work even harder than before. I must speak and listen to English more both in and out of class. I must read and write more, too. I must learn English well so that I can work well when I grow up. 

小题1:When I first started learning English, I thought __________.

A.I couldn’t learn it well because it is quite difficult

B.I could learn it well if I had remembered the new words and learned some grammar

C.English is interesting and easy to learn

D.each English word couldn't find a Chinese word with the same meaning小题2:Which of the following statements is NOT TRUE according to the text?

A.To understand English idioms is a useful way to learn English.

B.To pay attention to pronunciation and grammar helps us learn English well.

C.To read and write more is helpful in learning English.

D.To study English only means working hard.小题3:Which is the best topic of the passage? 

A.How to study English well

B.The importance of English

C.English idioms

D.Do more reading

题型:问答题
甲,乙两班举行电脑汉字输入比赛,参赛学生每分钟输入汉字的个数统计结果如下表:
班级参赛人数中位数方差平均字数
55149191135
55151110135
某同学分析上表后得出如下结论:①甲、乙两班学生成绩的平均水平相同;②乙班优秀的人数多于甲班优秀的人数(每分钟输入汉字≥150个为优秀);③甲班成绩的波动比乙班大.上述结论正确的是______(把你认为正确结论的序号都填上).
题型:问答题

患者,女性,23岁。反复下肢瘀斑,月经量增多1年。查血象:血红蛋白80g/L,红细胞3.0×1012/L,血小板19×109/L。初步诊断为慢性特发性血小板减少性紫癜。

药物治疗首选的药物是()。

A.止血药

B.血管扩张药

C.免疫抑制剂

D.糖皮质激素

E.铁剂

题型:问答题

女性,垫枕右侧卧位,左侧肩胛角尖端可叩得一相对浊音区,撤去枕头浊音区消失,此浊音是由于

A.左肺炎

B.左肺脓肿

C.脊柱弯曲

D.空洞型肺结核

E.肺梗死

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