单项选择题
A.10%~11%B.12%~13%C.14%~15%D.15%~16%
A.3~4kgB.4~5kgC.5~6kgD.6~7kg
A.0.2%~0.4%B.0.4%~0.6%C.0.6%~0.8%D.0.8%~1%
A.0.50%B.1.0%C.1.50%D.2.00%
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