N-PLURAL holidays 假期 [英国英语] [school slang]
Halogenated, sulphonated, nitrated or nitro-sated derivatives of phenols or phenolalco-hols.
酚及酚醇的卤化、磺化、硝化或亚硝化衍生物。
To study the drilling technique for decreasing the errors of ihe drilled hols as possible is to be ensured of the quality to use them.
光面爆破和预裂爆破技术已广泛地在路堑石方中应用，研究钻孔技术，尽量减少钻孔误差，是保证光面和预裂爆破的关键，在峒室加预裂一次爆破成型中尤为重要。
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