电烧伤最突出的病理改变是（）。

A.全层皮肤烧伤

B.肌肉坏死

C.神经受损

D.脏器损伤

E.血管栓塞

Rule 14 describes the action to be taken by vessel meeting head-on. Which of the following conditions must exist in order for this rule to apply?（）.

A.Both vessels must be power-driven

B.They must be meeting on reciprocal or nearly reciprocal courses

C.The situation must involve risk of collision

D.All of the above