单项选择题
A.6cmB.11cmC.13cmD.15cm
A.脚口-2B.脚口+1.5C.脚口+2D.脚口-1.5
A.72cmB.70cmC.68cmD.74cm
A.B/5+1cmB.B/5+2cmC.B/5+2.5cmD.B/5+3cm
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