问题
不定项选择题
按下图装置进行电解实验：A极是铜锌合金，B极为纯铜。电解质中含有足量的铜离子。通电一段时间后，若A极恰好全部溶解，此时B极质量增加7. 68g，溶液质量增加 0. 03g，则合金中Cu、Zn原子个数比为
A．6：1
B．4:1
C．3：1
D．任意比
答案
答案：C
搜题请搜索小程序“爱下问搜题”
按下图装置进行电解实验：A极是铜锌合金，B极为纯铜。电解质中含有足量的铜离子。通电一段时间后，若A极恰好全部溶解，此时B极质量增加7. 68g，溶液质量增加 0. 03g，则合金中Cu、Zn原子个数比为
A．6：1
B．4:1
C．3：1
D．任意比
答案：C
| 完形填空。 | ||||
| Last week I went to a supermarket. After I 1 the bill and was passing through the door, the alarm suddenly started to ring. Suddenly, a young guard ran toward me and ordered me to 2 him. I felt so upset and 3 . He took me to a small room, but I was 4 frightened that I stopped at the door. Finding me 5 to enter the room, he shouted that I had to go into the room. He closed the door. I thought he was going to hurt me. Suddenly, a 6 voice said in my ear: "Take out the things you've stolen!" "I stole nothing." I said. "Do as I tell you. If we find them, you'll be in trouble." "There is nothing." I answered. "I didn't take anything." I said, taking everything out of my pockets and bag. 7 this point, a guard came in and asked a salesgirl to 8 me. 9 , they found nothing. But they didn't believe that I hadn't stolen anything. So the young guard ordered me to pass through the door alarm again. I was 10 when it rang again. I felt 11 and burst into tears. I didn't know how to prove 12 I was innocent(清白的). They made me go into the small room again. "Take out the stolen things quickly, 13 we will dial 110." They said. "OK, call the police. I' m not afraid." I said 14 . Suddenly, they 15 their tone. After a while, a salesgirl asked me to raise my feet. I did 16 she had told me. There was a label (标签) on the bottom of my shoe. That was it! That was the 17 thing that had brought me such great trouble. But it 18 my innocence. After that, they 19 to me in the small room, But they should have apologized 20 , shouldn't they? A lot of people were there when I was taken away. What did they think of me? | ||||
|