【单选题】【消耗次数:1】
Severalscrews(螺丝)need____.
widening
enlarging
tightening
shortening
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①  修复体被动就位差
②  咬合干扰
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④  修复螺丝预紧力差
⑤  以上均是
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①  有的种植系统配套有取出断裂螺丝的工具盒
②  超声震动折断的螺丝断端,待其松动后逐渐逆时针旋出
③  直接磨除断裂的螺丝,小心勿伤到种植体内部螺纹
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【简答题】 简述使用螺钉螺丝刀的安全知识。
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