下图是a、b、c三种物质的溶解度曲线，下列说法正确的是( )

题干

A：a物质的溶解度一定小于b的溶解度

B：40℃时，a、b两种物质的饱和溶液中溶质的质量分数相同

C：c物质是一定是二氧化碳溶解度曲线

D：三种物质的饱和溶液分别从40℃降温到20℃，a、b 析出的晶体质量相等

上一题下一题 0.0难度选择题更新时间:2017-08-18 07:03:19

B

阅读下列材料，从A、B、C、D四个选项中选出最佳答案，并把答题卡上对应题目的答案标号涂黑。

Don't do your homework alone when you find it difficult! TFK's Homework Helper has many useful tools with tips to help you do your homework better.

	A + Papers Do you need help with writing homework? Check out A + Papers! It will show you how to write eight different kinds of school papers. Get Started!
	Flash-card Maker Do you know the state capitals? Check yourself with TFK’s flash cards (抽认卡), or make your own flash cards to study for your next exam. Get Started!
	Writing Suggestions How do you write a good article to introduce yourself? Find answers to all of your writing questions here. Get Started!
	Grammar Talent Do you know how to use commas (逗号)? Are you a talent when it comes to big letter? Go over grammar rules, and then test yourself with Grammar Talent. Get Started!
	Writer's Toolbox Whether you need a dictionary or an electronic (电子的) machine which can change one language into another, we’ve got you covered here. Get Started!