单项选择题
A.0.8 B.1.2 C.1.6 D.2
A.K≥1.05 B.K≥1.15 C.K≥1.25 D.K≥1.35
A.100MPa B.105MPa C.110MPa D.115MPa
A.25m B.1.53m C.7.65m D.5m
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