1) exposed-perforation ratio
破孔率
1.
The definitions of exposed-perforation ratio (EPR) and temperature coefficientof EPR are given,The relationship between EPR and temperature,pressure,and alsoloading density is discussed.
为了弄清包覆火药降低温度系数，提高初速的机理，该文用中止实验的方法研究了包覆火药的破孔过程，给出了破孔率及破孔率温度系数的定义，讨论了破孔率与温度、压力以及装填密度的关系，分析了破孔率温度系数与弹道温度系数的一致性。
2) broken hole
破孔
1.
Aim at the problem that the broken hole usually appears in demoulding, the process and key technology of demoulding based on Pro/E are described.
以Pro/E为平台 ,针对模具拆模过程中经常出现破孔的问题 ,论述了注射模具拆模的基本原理、流程、分模面的设计 ,以及分模面设计中填补破孔的三种主要方法 ,包括定义“环闭合”、定义“填充环”和构建曲面片 ,并介绍了各种方法的优缺
3) Holes
[英][həul] [美][hol]
破洞、破孔
4) deep-hole blasting
深孔爆破
1.
The calculation of surface deep-hole blasting parameters of Paishanlou gold mine in Liaoning;
辽宁省排山楼金矿露天深孔爆破参数的计算
2.
Discussion on the rock fragmentation of deep-hole blasting for Guishan quarry;
龟山料场深孔爆破的岩石破碎块度问题的探讨
3.
To lower blasted boulder yield is one of the most important technical considerations in deep-hole blasting operations of mine.
降低深孔爆破落矿大块率是矿山凿岩中的一个重要课题。
5) hole after hole explosion
逐孔爆破
1.
According to the geologic structure of the main stope,comprehensively using the advantages of hole after hole explosion and extrusion one,the demolition made breakthrough progress in the field that was difficult to be exploded.
文章分析了主采场大块率高的原因,根据主采场地质构造特点,综合应用逐孔爆破和挤压爆破的技术优点进行爆破攻关,在难爆区域取得了突破性进展,并取得了较好的经济效益和社会效益。
6) patching hole
靠破孔
1.
In terms of the problem of patching hole emerged in the design of parting profile by the software Pro/E,taken Alcatel OT535 mobile phone as an example,the basic way and main method of patching hole in design of parting profile are summarized.
针对应用Pro/E软件进行注射模分型面设计中出现的靠破孔问题,以阿尔卡特的OT535手机为例,归纳总结了设计分型面时填补破孔的基本思路和主要方法,解决了分型面设计中的关键问题。
补充资料：线路板孔破断口的细部特征图解
PTH孔破断口（俗称：包二奶） 
蚀刻的斜坡断口
蚀胶过度
玻纤拉扯
钻针挖破孔壁
孔壁粗糙引起孔破
蚀刻的斜坡断口
蚀胶过度
玻纤拉扯
钻针挖破孔壁
孔壁粗糙引起孔破
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条