单项选择题
A.5 B.10 C.15
A.1.5±0.1 B.1.5±0.2 C.2.0±0.1 D.2.0±0.2
A.CRB550 B.CRB650 C.CRB800 D.CRB970
A.0.1 B.0.2 C.0.3 D.0.5
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