手术暴露甲状腺时,最后切开的结构是()。
A. 皮肤
B. 浅筋膜
C. 封套筋膜
D. 气管前筋膜
E. 舌骨下肌群
Each OSV must carry().
A. one category I 406 Mhz satellite EPIRB
B. at least one life buoy on each side of the vessel fitted with a buoyant life line
C. at least 12 rocket parachute flares
D. All of the above
脑幕裂孔疝和枕骨大孔疝的临床表现及抢救方法有何不同?