单项选择题
A.1300~1500B.1300~1750C.1300~1850D.1550~1750
A.20~50B.35~70C.20~70D.35~80
A.2.5~5.0B.2.5~5.5C.2.8~5.2D.2.8~5.5
A.18%B.21%C.34%D.28%
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