单项选择题
A.125×75×10 B.125×80×10 C.125×75×12 D.125×80×12
A.1/4~2/3 B.1/3~2/3 C.1/2~1/3 D.1/2~2/3
A.<40 B.≤40 C.≥40 D.>40
A.1/3 B.2/3 C.1/2 D.3/4
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