试题与答案

将50℃的饱和碳酸钠溶液升温至60℃,或者温度仍保持在50℃而加入少量碳酸钠,在

题型:选择题

题目:

将50℃的饱和碳酸钠溶液升温至60℃,或者温度仍保持在50℃而加入少量碳酸钠,在这两种情况下均保持不变的是[ ]

A.溶液的质量

B.溶液中Na的数目

C.碳酸钠的溶解度

D.溶液中溶质的质量分数

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D解析:此题考查支气管哮喘的临床表现。支气管哮喘典型的临床表现为发作性的伴有哮鸣音的呼气性呼吸困难。其发作可历时数小时至数天,可自行或用药后缓解。在夜间及凌晨发作和加重常是哮喘的特征之一,...

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David got a job in a police station after he left school. He worked there for 42 years and he’ll retire this year. He worked hard in the past 42 years. But he was not a lucky man. Hefailed to catch a thief. He was often sorry for it.

Last weekend, while David's wife was cooking she found there was no salt at home. Soshe asked her husband to buy some. In the shop, David saw a young man taking away awallet from a woman's bag. He walked to him quietly, but the young man noticed David andran away at once. David ran after him. At last the thief ran into a blind alley(死胡同) andDavid caught him.

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“Who can give one to me?”said David, “I’ll soon retire and I catch athief for the first time!”

小题1:David worked hard in the past 42 years.

小题2:David was a lucky man, and he often caught thieves.

小题3: Last weekend his wife asked him to buy some sugar.

小题4:A young man was stealing a woman's wallet in a shop

小题5:The young man was the first thief that David caught.

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下列关于对工程项目实施阶段中设备监理大纲、监理规划及监理实施细则的表述中正确的是( )。

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