单项选择题
A.15 B.20 C.22 D.25
A.170cm-210cm B.220cm-300cm C.250cm-350cm D.300cm-400cm
A.21gal-50gal B.21gal-40gal C.31gal-50gal D.41gal-60gal
A.9项 B.10项 C.11项 D.12项
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