which material is a mixture?以下哪一项是混合物?1)水(water)2)空气(air)3)甲烷(methane)4)镁(magnesium)

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which material is a mixture?以下哪一项是混合物?1)水(water)2)空气(air)3)甲烷(methane)4)镁(magnesium)
which material is a mixture?以下哪一项是混合物?
1)水(water)
2)空气(air)
3)甲烷(methane)
4)镁(magnesium)

which material is a mixture?以下哪一项是混合物?1)水(water)2)空气(air)3)甲烷(methane)4)镁(magnesium)
(2)空气是混合物,主要成分有氮气(78%)、氧气(21%)、二氧化碳、惰性气体、水蒸汽

2)空气是混合物

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