单项选择题
A.60KG B.40KG C.15KG D.20KG
A.±1.0% B.±1.5% C.±2.0% D.±2.5%
A.±1% B.±1.2% C.±1.5% D.±2.0%
A.133 B.134 C.120 D.135
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