题目：
桩冠中冠桩末端的要求为
A．至少距根尖部0.5～1mm
B．至少距根尖部1～2mm
C．至少距根尖部2～3mm
D．至少距根尖部3～5mm
E．至少距根尖部5～8mm
答案：
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参考答案：E解析：[知识点] 睡眠
桩冠中冠桩末端的要求为A．至少距根尖部0.5～1mm B．至少距根尖部1～2mm C
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