题干

如图,海水淡化可采用膜分离技术,对淡化膜右侧的海水加压,水分子可以透过淡化膜进入左侧淡水池,而海水中的各离子不能通过淡化膜,从而得到淡水.对加压后右侧海水成分变化进行分析,正确的是(  )


A:溶质质量增加

B:溶剂质量减少

C:溶液质量不变

D:溶质质量分数减少

上一题 下一题 0.0难度 选择题 更新时间:2019-05-08 04:33:46

答案(点此获取答案解析)

B

同类题2

完形填空. 根据短文内容选择最佳答案。

    Boys and girls, this summer vacation is the time for you to take your mind off homework and prepare yourself for future life. The following is some advice on 1 to make your vacation meaningful and colorful.

   Take exercise. Regular exercise, much health. You 2 hard most of the time so far. Therefore, you need to join in outdoor activities, which can bring your whole body into action. You can benefit from different forms of exercise 3 swimming,jogging and mountain climbing.

   Learn some basic life skills. One day, you will live alone. As a result, you can't 4 your family any longer. In order to deal with your 5 matters in your own life, you should learn cooking, washing and other practical (实用的) skills.

   Go for a journey. Travel to places of interest. In this way, you can find the culture there different from  6  of your hometown. Beautiful scenery can  7 make you relaxed. Imagine that you are lying on the warm beach in bright sunshine, with light seawind gently blowing. Isn't it enjoyable and comfortable?

   Enjoy family time. Home is the place in which you can rest, receive love and care from relations. Don't always sit in front of a computer alone. Instead, the whole family should spend 8 watching a movie on the sofa together. Besides, it's great fun for family members to gather around the table,   9sports, clothes or other common topics (话题).

   If you follow the advice above, you will achieve health, independence (独立),peace of mind and feelings between family members. Today is the beginning of a new life. Your summer vacation must be full of  10 and success. Wish you a wonderful time!