问题
选择题
下列实验操作中正确的是（ ）
A．称量氢氧化钠时，在托盘上各放一张同样质量大小的纸张
B．蒸馏时，应使温度计水银球插入液面以下
C．蒸发结晶时应将溶液蒸干后再停止加热
D．分液时，分液漏斗下层液体从下口放出，上层液体从上口倒出
答案
答案：D
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下列实验操作中正确的是（ ）
A．称量氢氧化钠时，在托盘上各放一张同样质量大小的纸张
B．蒸馏时，应使温度计水银球插入液面以下
C．蒸发结晶时应将溶液蒸干后再停止加热
D．分液时，分液漏斗下层液体从下口放出，上层液体从上口倒出
答案：D
| 完形填空。 听短文，根据所听内容选出短文中划线部分词的同义词或同义短语。 | |||
| Mr White works in an office. One day, when he had lunch, a friend 1 him. They were very 2 and talked a lot. Then they looked at the clock on the wall. It was time to go to office. He had to say goodbye to his friend and left. It was raining 3 and the streets were wet. He drove too fast to see the red lights. He couldn't stop his car and hit a car in front of his. An old man got off and 4 angrily, "What are you doing? Do you want to hit me to death?" "I'm sorry,sir,"said Mr White."I didn't find the lights turned red. Then he brought out a bottle of wine and gave it to the old man. "It's very cold today,sir,"said Mr White."Please drink a little, then you'll be warmer." The old man drank some wine and became happy. "I'm feeling much better now. 10 drink any? "he asked. "I can't drink anything now,sir,"answered Mr White."I'm waithing for the policeman to come. Only drunkards(酒鬼) cause accidents, you know." | |||
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