题干

下列说法正确的是(    )

A:20 ℃时20 g某物质溶解在100 g水里形成溶液,则20 ℃时某物质的溶解度是20 g

B:20 ℃时20 g某物质溶于水制成饱和溶液,则20 ℃时该物质的溶解度是20 g

C:20 g某物质在100 g水里恰好制成饱和溶液,所以该物质的溶解度为20 g

D:20 ℃时100 g水里最多只能溶解20 g某物质,则20 ℃时该物质的溶解度为20 g

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答案(点此获取答案解析)

D

同类题3

       Sam Higgins was a famous photographer. He travelled all over the world, taking photos for magazines and newspapers. He had photographs of earthquakes, forest fires, floods, even wars. If something interesting happened, Sam went to photograph it. His photographs won many prizes and he earned a lot of money.
      He was a married man and his wife often asked him to take her with him, but he always refused. “I travel for work, not for pleasure,” he told her. “You won't enjoy yourself, and I won't have time to look after you. Sometimes there's not even anywhere to stay and I have to sleep outside. I often don't have a good meal or a bath for days. You won't like it”
    “Sam, I'm not a child,” his wife argued. “I can look after myself. Please, take me with you next time you go overseas.”
    Sam did not say anything but he thought about it, and when he was asked to go to Africa he said, “You can come to Africa with me if you want to. I've got to take photographs of the wildlife there. It should be interesting and not too uncomfortable. We'll be staying with a ranger(森林管理员) ”
    His wife was very excited, and at first she had a very enjoyable time.
    Then one day, Sam went off to find some lions to photograph. His wife went with him, but before long they became separated(分开). They came to a fork on the way, and she walked down one way while he walked down the other. Then Sam heard her screaming. He ran back to the fork on the way and saw her running forward him. A huge lion was chasing her. Quickly Sam took out his camera and pointed it at his wife and the lion. Then he shouted, “Slow down, woman. I can't get you both in the picture.”