牙周膜厚度平均为A.0.21~0.30mm B.0.5~3mm C.0.18~3mm D.0.15~0.38mm E.0~2mm

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问题 牙周膜厚度平均为

选项 A.0.21~0.30mm
B.0.5~3mm
C.0.18~3mm
D.0.15~0.38mm
E.0~2mm

答案D

解析
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