1·The sonic field transmission matrixes of perforated absorbent pipe is given after the transmission performance of perforated pipe is studied.
本文通过声波在穿孔声管中传播特性的研究，导出了声波在穿孔声管中传播的声场传递矩阵。
2·The results show that choosing perforated pipe with suitable structure and putting it into the thermosyphon can enhance the heat transfer effect.
结果表明，合理选择分流管的结构尺寸，将其置于热虹吸管内，可以起到强化沸腾换热的效果。
3·Compared with perforated pipe distributor, perforated weir-riser distributor has smaller wall flow, bigger operation elasticity and simpler structure, it is easy to install.
该分布器与原来的多孔直管式分布器比较，具有壁流量小，操作弹性大的优点，而且此分布器结构简单，安装方便。
4·The hydraulic calculation of perforated outlet pipe of secondary sedimentation thank has been presented in this paper.
主要介绍了二次沉淀池淹没式穿孔出水管的水力计算方法。
5·The perforated interval is long and perforating gun is in much vibration at horizontal section, which may cause pipe sticking accident.
射孔井段长，射孔枪在水平井段震动大，可能发生卡钻事故。
6·The results indicate that the perforated pavement and perforated rainwater drainage pipe system reduce run off and replenish underground water remarkably.
试验结果表明，采用透水铺盖面及渗透式雨水管道系统，对削减径流、补充地下水源有显著效果。