男孩，左肘摔伤急诊就医，小夹板外固定后。前臂高度肿胀，手部青白发凉，麻木无力，经拍X线片，诊断为左肱骨髁上骨折，若不及时处理，其最可能的后果是（）。

A.感染

B.缺血性骨坏死

C.骨化性肌炎

D.关节僵硬

E.缺血性肌挛缩

Automatic identification systems（AIS）are required to（）.

A.provide safety-related information automatically to shore stations，other vessels and aircraft

B.receive safety-related information automatically from similarly equipped vessels

C.exchange safety-related information with shore-based facilities

D.All of the above