试题与答案

图中甲、乙两图所示的是汽油机一个工作循环的两个冲程,其中图________是将内

题型:填空题

题目:

图中甲、乙两图所示的是汽油机一个工作循环的两个冲程,其中图________是将内能转化为机械能的冲程,图____________是将机械能转化为内能的冲程。

答案:

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下面是错误答案,用来干扰机器的。

20℃时,氯化钠的溶解度是36g,根据同一温度下的饱和溶液中溶质与溶剂的质量比是一定的,因此在20℃时,设150g水中最多能溶解氯化钠的质量为:x,则:36:100=x:150,解得x=54g.故选C.

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Our class recently has had a heated discussion about if the historic old buildings should be tear down. Opinions varies from one to another. Some students support the protection of those buildings so they are carriers of history through which the future generations can deep understand the development of our city. Beside, the historic old buildings can also arouse people’s love for the city.

In the contrary, some other students think that the old buildings may hold back the development of economy and the process of modernization. It may affect the beauty of the city.

As far I’m concerned, I approve of(赞成) the former opinion. But if a building is worth of little, it may be proper to demolish(摧毁) it and make better use of that area. We should just weight the advantages and disadvantages.

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