圆锥型套筒冠固位体内冠厚度一般是 ( ) A.0.4mm B.0.3mm C.0.5mm D.0.15mm E.0.2mm

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问题圆锥型套筒冠固位体内冠厚度一般是 ( )

选项 A.0.4mm
B.0.3mm
C.0.5mm
D.0.15mm
E.0.2mm

答案B

解析

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