齿轮在什么俏况下应进行更换？

A. 动脉畸形
B. 静脉畸形
C. 毛细血管扩张症
D. 动静脉畸形
E. 混合性畸形

A. running rigging leading aft from the masts
B. running rigging leading forward from the masts
C. standing rigging leading aft from the masts
D. standing rigging from the trees to the mast head