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【单选题】
有管预备描述不正确的是A.
预备过程分为根冠2/3和根尖区1/3预备
B.
预备后的根具有从根到根尖的连续锥度
C.
通畅锉一般采用8#或10#不锈钢K锉
D.
初锉一般指15#锉
E.
主锉至少应扩大到25#
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