survey by diver

this paper give us the ping check method,process and attention for surface ship using three bolts ping equipment, provide the reference for us when we do the same work.

本文介绍了用三螺栓潜水装具对水面舰船潜水检查作业实施方法、步骤及注意事项,为各位同行进行同类作业时提供参考。