JT/T 321-1997 Established requirement of the lighthouse and its facilities. 1范围 JT/T 321规定了海区不同类别、等级...
JT交通运输标准
JT交通运输标准
JT交通运输标准
JT/T 321-2020 灯塔主体及附属设施设置要求
JT/T 321-2020 Lighthouse primary and subsidiary facilities setup requirements. 1范圈 JT/T 321规定了海区灯塔分类...