理想的冠桩直径应为根径的A.1/2 B.1/3 C.2/3 D.1/4 E.1/5

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问题 理想的冠桩直径应为根径的

选项 A.1/2
B.1/3
C.2/3
D.1/4
E.1/5

答案B

解析
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