单项选择题
A.0.25mB.0.5mC.0.75mD.1m
A.0.15mB.0.5mC.1.0mD.1.25m
A.1mB.0.75mC.0.5mD.0.25m
A.800MnB.6000MnC.8000MnD.10000Mn
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