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【单选题】
抗绿脓杆菌最强的头孢菌素是（）
A.
头孢唑啉
B.
头孢呋
C.
头孢曲松
D.
头孢他定
E.
头孢噻肟
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A.
颌力过大
B.
黏固剂被溶解
C.
固定桥强度差
D.
共同就位道不一致
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【单选题】男，46岁。3年前行固定义齿修复，目前咬合疼痛，义齿松动，要求重新固定义齿修复。检查：固定桥修复体己脱位，固位体为3/4冠，全冠，基牙Ⅰ度—Ⅱ度松动。 固定义齿脱落的原因是
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