问题
选择题
胶体区别于其他分散系的本质特征是
A．胶体的分散质能通过滤纸空隙，而浊液的分散质不能
B．产生丁达尔现象
C．分散质粒子直径在1nm～100nm之间
D．胶体在一定条件下能稳定存在
答案
答案：C
题目分析：ACD昰胶体的性质，只有C是胶体区别于其他分散系的本质特征。
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胶体区别于其他分散系的本质特征是
A．胶体的分散质能通过滤纸空隙，而浊液的分散质不能
B．产生丁达尔现象
C．分散质粒子直径在1nm～100nm之间
D．胶体在一定条件下能稳定存在
答案：C
题目分析：ACD昰胶体的性质，只有C是胶体区别于其他分散系的本质特征。
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| When you are in England, you must be careful in the streets because traffic drives on the left. __1__ you cross a street, you must look to the right first and then left. If the traffic lights are __2__, the traffic must stop. Then the people on the foot can cross the road __3__.If the traffic lights are green, the traffic can go on, people on foot __4__cross. In the morning and in the evening, when people go to or from work, the streets are very __5__.Traffice is most dangerous then. When you go by bus in England, you have to be carefully, too. Always remember that traffic moves on the __6__. So you must be careful. Have a look first, __7__ you will go the wrong __8__. In many English cities, there are big buses __9__ floors. You can sit on the __10__ floor. From there you can see the city very well. It's very interesting. | ||||
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