题目：手术进行中的无菌原则哪项不对（ ） The principle of sterility in the operation which is not right ( )
A. 切开皮肤后须用无菌皮巾保护切口/After skin incision, sterile skin towel should be used to protect incision.
B. 无菌器械台保持清洁干燥/Sterile instrument table to keep clean and dry
C. 手术器械落至台面以下的手术单边缘以上的应取回再用/Surgical instruments falling below the table above the edge of the surgical single should be retrieved and reused.
D. 手术人员需调换位置时应背对背调换/The surgical personnel should be changed back to back when they need to change the position.
E. 切开空腔脏器前应用纱布垫遮盖保护周围组织/Before cutting the hollow viscera, gauze pads were used to cover and protect the surrounding tissues.
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