急性心肌梗死引起室间隔穿孔大多因为哪支血管急性闭塞（）

A.前降支

B.对角支

C.右冠状动脉

D.回旋支

E.左冠状动脉主干

All of the following are distress signals under the Rules EXCEPT（）.

A.International Code Signal AA

B.orange-colored smoke

C.red flares

D.the repeated raising and lowering of outstretched arms