题干

将a%的某物质的水溶液加热蒸发掉m g水(溶质不挥发、且蒸发过程无溶质析出),所得溶液体积为V L,溶质的质量分数为蒸发前的2倍,设溶质的相对分子质量为M,则蒸发后所得溶液的物质的量浓度为(   )

A:

B:

C:

D:

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答案(点此获取答案解析)

D

同类题4

阅读下面短文,并根据所读内容在文章后表格中的空格里填入一个最恰当的单词,每个空格只填1个单词。

A good book can teach you things beyond your class. It can open your eyes and clear your minds. If you want to get into a good reading habit, there are a number of ways to develop it.

Plan your time

You should give yourself at least thirty minutes in all for reading every day. When time is set, nothing can change it. For example, make it a habit to read during breakfast or lunch time.

Always carry a book

Wherever you go, take a book with you. When you leave the house, make sure that you always carry a good book as well as your school things. Remember that a book always stays with you.

Find a quiet place

Find a place in your home where you can sit in a comfortable chair. When you read a book, no one will trouble you. There should be no televisions, computers, music or even noisy family members around you.

Have a library day

Have a library card, and you can read as many good books as possible in the library. Make it a weekly trip to the library. You can save a lot of money.

Blog it

One of the best ways to develop a good reading habit is to put it on your blog(博客). If you don’t have one, create one. It’s free. Ask your friends and family to go there to share your ideas and offer you suggestions.

Title

Some ways to have a good reading____ 

Plan your time

You should read at least half a(n) ____  every day. Make it a habit to____ during breakfast or lunch time.

Always ____ a book

Make sure a book always stays with you wherever you go.

Find a quiet place

Find a place at home with a____  chair and without television, ____ music or noisy people around you.

Have a ____  day

It is very cheap way to read good books in the library. Go on a trip to the library every____ .

Blog it

It____  no money to create a blog. Your friends and family can share your ideas and____  you some suggestions online.