单项选择题
A.86.5mm B.86.6mm C.86.7mm D.86.8mm
A.80.5mm B.80.6mm C.80.7mm D.80.8mm
A.74.1mm B.75.1mm C.76.1mm D.77.1mm
A.68mm B.68.3mm C.69mm D.69.3mm
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