In the designation of marine pipe it is possible that the pipe may be impacted by the objects fallen from the vessels or by the trawlnet during the service life ( usually 20 ~ 30 years ) .

在海底管道设计中要 考虑到在整个 海底管道运行期间（通常是20～30年）管道有可能受到由水面船只上掉下的物体或 船只 拖网 鱼具的冲击。

An approach to the mesh size of trawlnet and its effect on trawling speed

拖网网目尺寸及其速度效应的探讨

In this paper the results of the fishing improvement test for the octopus trawlnet operated by Chinese fishing vessels in the West Sahara waters were conducted .

本文阐述中国渔船在西撒哈拉沿海捕捞章鱼的 单 拖网的改进和试验结果。

The fishing improvement test of Octopus trawlnet in the West Sahara waters

西撒哈拉 沿海章鱼 拖网的改进试验

An application of nozzle propeller to auxiliary powered fishing boat and its match for trawlnet

应用导管螺旋桨的机帆渔船与 拖网匹配 试验

On the flexible wing - type float of the trawlnet

柔性翼形 浮子的研究