单项选择题
A.烟B.无烟C.褐D.贫
A.1.2~1.5B.1.3~1.6C.1.5~1.8D.1.4~1.7
A.0.02~0.04B.0.01~0.03C.0.01~0.02D.0.02~0.03
A.0.3B.0.5C.0.2D.0.4
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