A.a =" b=" c | B.2a =" 2b" =" c" | C.a =" b" =" 2c" | D.都不正确 |
a/b | 固体物质的成分 | 气体物质的成分 |
<1/2 | | |
=1/2 | | |
=1/1 | | |
>1/1 | | |
A.食醋 | B.淀粉 | C.pH试纸 | D.酚酞试液 |
A.2.93 g | B.5.85 g | C.6.56g | D.无法确定 |
实验步骤 | 预期现象和结论 | |
① | 取少量上述漂白粉于试管中, | |
② | | |
③ | | |
A.3:2:1 | B.1:2:3 | C.9:3:1 | D.1:3:9 |
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