对水平平行双线顶管之间的相互作用进行了分析，提出了横向扰动区范围的计算公式。
The interaction of two level parallel pipe jacking is analyzed; and the calculation of lateral disturbance scope is advanced.
本文给出了一种新型双偶极子型宽带印制天线，并设计出相应的类平行宽边耦合双线双面馈电结构。
A new type of broadband printed twin dipole antenna is proposed in this paper. Corresponding feed structure of broadside coupled parallel line is also designed.
袋口热合封口机，可同时缝制两条平行的双线链式线迹，具有更佳的密封性。
Model GK8-24 double-needle four-thread bag sewing closer adapted two paralleled double thread chain stitch with auto-cut system.
袋口热合封口机，可同时缝制两条平行的双线链式线迹，具有更佳的密封性。
Model GK8-24 double-needle four-thread bag sewing closer adapted two paralleled double thread chain stitch with auto-cut system.
应用推荐