It is known to all that sea water__(contain)salt.

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• all we'd have to do to make use of sea water in the world is to remove the salt.的翻译
• It is known to all that sea water__(contain)salt.
• all we'd have to do to make use of sea water in the world is to remove the salt.的翻译
• billing period
• 一定量的Na2CO3和NaHCO3的均匀混合物分成质量不等的三份，分别与50mL相同浓度的盐酸反应，得到气体的质量与固体混合物的质量关系如下表所示： 组 别 1 2 3 固体质量/g 3.80 6.20 7.20 气体质量/g