问题
选择题
下列仪器常用于物质分离的是（ ）
① ② ③ ④ ⑤ ⑥
A．③⑤⑥
B．②③⑤
C．②④⑤
D．①②⑥
答案
答案：B
题目分析：漏斗可进行固液分离，分液漏斗可进行互不相溶的两种液体的分离，蒸馏烧瓶可进行互溶的两种液体的分离，因此②③⑤可以用来物质的分离。答案选B。
点评：本题主要考察物质分离的方法和所用仪器，简单基础。
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下列仪器常用于物质分离的是（ ）
① ② ③ ④ ⑤ ⑥
A．③⑤⑥
B．②③⑤
C．②④⑤
D．①②⑥
答案：B
题目分析：漏斗可进行固液分离，分液漏斗可进行互不相溶的两种液体的分离，蒸馏烧瓶可进行互溶的两种液体的分离，因此②③⑤可以用来物质的分离。答案选B。
点评：本题主要考察物质分离的方法和所用仪器，简单基础。
| 根据短文内容，用方框中所给单词填空，每词限用一次。 | |
important and 2 to us? Because they can help us do things faster and 3 . A washing machine helps us to wash clothes. A printing machine helps us to 4 a lot of books, newspapers, magazines and many 5 things quickly. Bicycles, cars, trains and planes are all 6 , too. They help us to travel faster than on foot. The computer is a wonderful machine. It was 7 not long ago. It not only stores information but also computes numbers millions of times as 8 as a scientist does. Let's study hard and try to use all 9 of machines. I think we can build China into a 10 country in the future. |