单项选择题
A.42.5MPaB.45.0MPaC.52.5MPaD.32.5MPa
A.200tB.500tC.4000tD.5000t
A.5.0%B.2.0%C.1.5%D.0.75%
A.5.0%B.6.0%C.2.0%D.3.0%
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