单项选择题
A.2500B.2300C.2800D.3000
A.0.11-0.60B.0.13-0.67C.0.125-1.25D.0.11-1.60
A.4.8-50B.4.8-45C.4.8-48D.4.8-55
A.10B.14C.18D.20
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