英语词汇roof periodic caving怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	roof periodic caving
释义	roof periodic caving 简明释义顶板周期垮落网络释义 1 [矿业]?顶板周期垮落顶板周期垮落短语 1 roof periodic caving law 顶板周期垮落规律双语例句 1 Based on field observations and theoretical analyses, the characteristic of periodic caving of immediate roof and main roof in a room and pillar system was analyzed. 通过理论分析和现场实测，对房柱式采煤的矿压显现规律及其特点进行了探讨。
随便看	percutaneous needle percutaneous needle aspiration biopsy percutaneous needle biopsy percutaneous needle lung biopsy percutaneous needle nephrostomy percutaneous nephrolithotomiy percutaneous nephrolithotomy percutaneous nephrolithotripsy percutaneous nephropyelostomy percutaneous nephroscope set percutaneous nephrostolithotomy percutaneous nephrostomy percutaneous nerve excitability test percutaneous nerve stimulation percutaneous noncatheter brachial method Percutaneous Nucleotomy percutaneous on-surface stimulation percutaneous on surface stimulation percutaneous oxygen monitoring percutaneous pacemaker Percutaneous penetration percutaneous peripheral artery angioplasty percutaneous pin fixation percutaneous pinning fixator percutaneous puncture

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