单项选择题
A.1mm B.2mm C.3mm D.4mm E.5mm
A.2mm B.5mm C.8mm D.10mm E.15mm
A.与黏膜密合 B.离开0.5~1mm C.离开1.5~2mm D.离开2.5~3mm E.离开3.5~4mm
A.1~2mm B.3~4mm C.5~6mm D.7~8mm E.9~10mm
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