问题
选择题
把烧杯中80℃的硝酸钾饱和溶液冷却至室温，下列说法错误的是[ ]
A．烧杯中的溶剂的质量不变
B．烧杯中溶液的质量减少
C．烧杯中硝酸钾的质量不变
D．烧杯中溶液的质量不变
答案
答案：D
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把烧杯中80℃的硝酸钾饱和溶液冷却至室温，下列说法错误的是[ ]
A．烧杯中的溶剂的质量不变
B．烧杯中溶液的质量减少
C．烧杯中硝酸钾的质量不变
D．烧杯中溶液的质量不变
答案：D
How do you go to school? Some students may answer, “By car”. Maybe some others will look at them through green glasses (羡慕地). You feel bad if you have no cars. It’s true that cars are . Many people find it hard to think about life will be like if they have no cars. But now more people know that too many cars bring great . They make streets too . People are trying to stop pollution (污染) from cars. way is to make green cars. But it much to make these cars. And more people think about better ways. We can our lifestyle. A lot of Americans go to work bike now. Riding bikes is clean and healthy. It helps people get strong. Let’s try together! I hope we can live in a green world with no pollution .
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