单项选择题
根尖狭窄部距牙齿实际的根尖部为()
A.0.1~0.2mm
B.0.3~0.4mm
C.0.5~1.0mm
D.1.2~1.5mm
E.1.6~2.0mm
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单项选择题
A.0.1~0.2mm
B.0.3~0.4mm
C.0.5~1.0mm
D.1.2~1.5mm
E.1.6~2.0mm