题目

（5分）向装有等量水的A、B、C烧杯中分别加入10g、20g、25g硝酸钾固体，充分溶解后，现象如图一所示。 （1）烧杯A中溶液的溶剂是        。（2）烧杯A、B、C中的溶液一定属于饱和溶液的是     （填序号）。（3）图二能表示硝酸钾溶解度曲线的是       （填“甲”或“乙”）。（4）由图二分析，若分别将100g甲、乙的饱和溶液从t2℃降温到t1℃，对所得溶液的叙述正确的      （填序号）。A．甲、乙都是饱和溶液           B．所含溶 基础训练篇（12） We all know that computers have played and (1)__________ play a very important part (2)___________ various fields. In personal lives, computers can do lots of work. It can carry (3)___________ people’s instructions.  In agriculture, computers are used (4)_____________ control the (5)__________(grow) conditions of vegetables and other plants. In transportation(交通运输), computers can work out the best distance (6)__________ trains and operate the trains instead (7)____________ human beings. In the fields of education, health and scientific research, computers are important, (8)___________. People use them to store information (9)______________ records. Because of the computers, life is easier and (10)________ convenient for people.