问题
选择题
等物质的量的钠、镁、铝与足量稀H2SO4反应生成的氢气的物质的量之比是( )
A.1:1:1
B.1:2:3
C.3:2:1
D.6:3:2
答案
答案:B
等物质的量的钠、镁、铝与足量稀H2SO4反应生成的氢气的物质的量之比是( )
A.1:1:1
B.1:2:3
C.3:2:1
D.6:3:2
答案:B
从方框中选出适当的句子补全对话,有两项多余。(5分) A: Good morning. B: 1 A: Do you have a friend here? B: Yes, I do. A: 2 B: Oh. She is my friend, Amy. A: 3 B: She comes from the U.S.A. A: She looks like Judy. B: 4 A: Are they in the same class? B: No. They are in the same grade. 5
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