枪身同时有步枪和散弹枪两种以上枪管的枪械，通常是铰练式枪机，枪管是并排式（side-by-side）或叠排式（over-and-under）。
介绍一种复合射孔器模拟试验装置和动态压力测试方法，可对复合射孔器射孔单元组成模拟枪体，在相配套的模拟试验装置内进行试验。
Introduced are a simulating device of fracture perforators and a dynamic pressure testing method. Some simulation body composed of combined perforator units can be tested in the simulation device.
本发明涉及一种探头芯体专用树脂沙及用其制作的高效能结构副枪复合探头。
The invention relates to resin sand specially used for probe cores and a high-efficient structural sublance dual probe made of the resin sand.
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