题目

8 g无水硫酸铜配成0.1 mol·L-1的水溶液，则下列说法正确的是（    ）A.溶于500 mL水中B.溶解后得到500 mL溶液C.从中取出100 mL溶液，其浓度为0.02 mol·L-1D.从中取出1 mL溶液，其浓度为0.01 mol·L-1 答案：解析：8 g无水硫酸铜的物质的量n（CuSO4）=8 g/160 g·mol-1=0.05 mol，溶液的体积=0.05 mol/0.1 mol·L-1=500 mL。答案：BSan Francisco has many museums. You can visit one and learn something new, We have art, science, history and other special museums. Some museums are open every day. Some are only open on certain days. Many museums are expensive, and others are free. But some of the expensive ones have free days. May museums have websites. The websites usually have information about the things you can see in the museums. On a museum's website you can get information about .ticket prices and free days. You can also know where the museum is and when it is open. Sometimes the information is on the first page, and it's very easy for you to find. But sometimes you have to click (点击) on the words like Visit Information, or About to find the information. That will be hard work for you.1.San Francisco has many museums for you visit and .A. learn something new B. play computer gamesC. watch the movies D. click on Information2.Some museums in San Francisco are open every day, but some are only open .A. on weekdays B. on weekendsC. on certain days D. on holidays3.Many museums have with information about the things you can see in them.A. ticket prices B. their websitesC. open hours D. free days