喉裂开术应注意的事项不包括哪一项（）

A.保持正中切开

B.声带前端有时需要缝合固定

C.为充分暴露术野需切除甲状腺峡部

D.修复喉腔创面

E.检查喉腔有无纱条或棉片遗留

A backlash below a lock is defined as a（）.

A.current setting your vessel on the wall

B.current setting into the lock chamber

C.an eddy working along the lower guide wall

D.current setting counterclockwise