单项选择题
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
A.与黏膜密合 B.离开黏摸0.5~1.0mm C.离开黏摸1.5~2.0mm D.离开黏摸2~2.mm E.离开黏摸3~4mm
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