“perimeter blasting”的概念、定义、翻译、参考文献-科学参考

单词	perimeter blasting
释义	perimeter blasting [pǝ`rim·ǝd·ǝr ¦blast·iŋ] ^{MINING ENGINEERING} A method of blasting in tunnels, drifts, and raises, designed to minimize overbreak and leave clean-cut solid walls; the outside holes are loaded with very light continuous explosive charges and fired simultaneously, so that they shear from one hole to the other.
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