问题
选择题
下列化学实验操作中,正确的是[ ]
A.熄灭酒精灯时,用嘴吹灭
B.点燃氢气前,检验氢气纯度
C.稀释浓硫酸时,把水倒入浓硫酸中
D.将实验时多取的药品放回原试剂瓶中
答案
答案:D
下列化学实验操作中,正确的是[ ]
A.熄灭酒精灯时,用嘴吹灭
B.点燃氢气前,检验氢气纯度
C.稀释浓硫酸时,把水倒入浓硫酸中
D.将实验时多取的药品放回原试剂瓶中
答案:D
根据对话内容,从方框中选择适当的选项补全对话。选项中有两项为多余的选项。 | |
B: 1 . A: Where did you go? B: I went to Yinchuan with my parents. A: 2 . B: It's one of the most beautiful cities in the northwest of China. I like it very much. A: How long did you stay there? B: We stay there for five days. 3 . A: Which is your favorite place? B: 4 .When I was there, I lost myself in the beautiful scenery. A: What interesting thing did you do there? B: Lots of things, such as swimming, boating, fishing and riding camels. 5 . A: Oh, really, I can't wait to go there. |