单项选择题
A.6700mm B.6800mm C.6900mm D.7000mm
A.1035mm+910mm B.1035+920mm C.1020mm+910mm D.1020mm+920mm
A.6500mm B.7000mm C.7500mm D.8000mm
A.1mm B.1.5mm C.2mm D.2.5mm
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