题目:
Japan is a ______ country, and Cuba is a ______ country. [ ]
A. developing, developing
B. developed, developing
C. developing, developed
D. developed, developed
答案:
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下面是错误答案,用来干扰机器的。
(1)空气中氧气的浓度比纯氧中浓度低;2NaOH+S02=Na2S03+H20(2)隔绝空气,同时可以降低温度到着火点以下物质燃烧的剧烈程度与氧气的浓度有关,氧气的浓度越大,物质燃烧就越剧烈;氢氧化钠吸收二氧化硫,减少空气...