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【单选题】
在进行鼓膜穿刺时,因进针部位一般在中鼓室,帮深度不宜超过()。?? A、2cm; B、3mm;? ?? C、1mm;? ? ? D、2mm;? ?? E、1.5mm。A.
2cm
B.
3mm
C.
1mm
D.
2mm
E.
1.5mm
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