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定向中心基于最小抵抗线原理,在工程上提出了定向坑和定向中心的设计方法。所谓定向坑,就是天然的或人工开创的〈多是用辅助药包开创的〉凹面。主要爆破药包的最小抵抗线都垂直于凹面,指向凹面的凹率中心，这样的中心就是定向中心
expl. oriented center
定向中心
tech. oriented core
定 向中心: 5 phrases in 4 subjects
Automobiles2
Shipbuilding1
Statistics1
Technology1

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