单项选择题
A.2~6mm B.3~6mm C.6~8mm D.5~9mm E.6~10mm
A.1~2mm B.2~3mm C.3~4mm D.4~4mm E.5~6mm
A.2~6mm B.3~6mm C.4~8mm D.5~9mm E.6~10mm
A.3~7cm B.4~8cm C.5~9cm D.6~10cm E.7~11cm
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