＂J＂shaped pkt.是什么意思

用法例句

The J-typed ventilation,based on the U-typed ventilationi,s specially designed with one inflow and two outflows for draining gas better.

J型通风采空区渗流为“一源两汇”,并有明显取近道的趋势,J型通风比U型通风更有利于瓦斯排放。

Analyses the behavior of J-type flange temperature changing with ambient temperature and air temperature in duct, presents the temperature distribution pattern of the air duct with J-type flange.

归纳并设计F型、T型和J型三种复合玻纤风管法兰,通过自制的实验装置对它们的温度及J型管道表面温度进行测试,分析了J型法兰温度随环境温度及风管内气流温度的变化规律和J型法兰风管表面温度的分布状况。

The operation of J valve is very convenience, which is usually used in circulating fluidized bed boilers.

J型阀运行简单 ,在循环流化床锅炉得到应用 。