救生圈救生圈是船舶在救助人员不慎落水时使用的种救生工具.它具有重量轻,使用方便、价格便宜等优点.在船舶遇海事沉没时,也可以作为船员或旅客的救生浮具使用.早年的救生圈的浮力材料,曾用灯芯草、软木、竹片等原料,现代救生圈则多用聚苯乙烯泡沫塑科或其他船检认可的,有足够浮力的材料.一般救生圈的形状,均为圆环,内径至少为 Life buoy lifebuoy is the kind of life-saving tool used by the ship when rescue workers accidentally fell into the water.It has the advantages of light weight, easy to use, cheap price, etc. It can also be used as a lifesaver for sailors or passengers when the ship is sunk in the sea. Buoyancy buoyancy material, used wicker grass, cork, bamboo and other raw materials, the modern lifebuoy is more with styrofoam Branch or other ship inspection may have sufficient buoyancy material. The shape of the general life buoy, are ring , The inner diameter of at least