在不同的时间段，测定存放于普通球胆及特制的锡箔袋内的一氧化碳标准气的浓度，来探讨其浓度值与贮存时间的关系。
In order to investigate the variation of the concentration of carbon monoxide with time, we analysed the concentration of carbon monoxide in tinfoil gas collecting bag and ordinary gas collecting bag.
考虑一下你准备怎样把这些菜存在冰箱里，你需要保鲜袋、铝箔面包锅或是锡箔吗？
Plan how you will store the meals in your freezer. Do you need freezer bags, foil loaf pans or tin foil?
考虑一下你准备怎样把这些菜存在冰箱里，你需要保鲜袋、铝箔面包锅或是锡箔吗？
Plan how you will store the meals in your freezer. Do you need freezer bags, foil loaf pans or tin foil?
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