单项选择题
A.1.0m B.1.5m C.2.0m D.2.5m
A.5.5m B.6.5m C.7.5m D.8.5m
A.2.0MPA B.2.1MPA C.2.2MPA D.1.9MPA
A.5% B.10% C.15% D.20%
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