In the case of small leakage or small size perforation of gathering pipeline, field patching approach is often adopted in doing rush repair.
当集输管道泄漏或穿孔尺寸比较小时，往往采用现场补焊的方法进行抢修。
The results show that the porosity of plant fiber is the main intensity factor, and followed is the perforation of the configuration forms, and size of perforation is independent.
试验结果表明：植物纤维穿孔板静曲强度的主要影响因子是孔隙率，其次是穿孔的排列方式，与孔径大小无关。
The rules of perforation exposing process and combustion of mixed charge under different temperature, propellant type and web size are compared.
比较了不同的温度、药型和弧厚条件下，混合装药的破孔及燃烧规律。
The rules of perforation exposing process and combustion of mixed charge under different temperature, propellant type and web size are compared.
比较了不同的温度、药型和弧厚条件下，混合装药的破孔及燃烧规律。
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