题目内容
若用舌杆连接，舌杆的正确位置为
2021-11-10
A.紧挨龈缘和黏膜
B.离开黏膜0.1 mm,边缘距銀缘1mm
C.离开黏膜0.2 mm，边缘距龈缘2 mm
D.离开黏膜0.3 mm，边缘距龈缘3 mm
E.离开黏膜0.5 mm，边缘距銀缘5 mm
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