英语词汇first roof 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	first roof caving
释义	first roof caving 简明释义直接顶初次垮落专业释义 1 冶金工程技术直接顶初次垮落双语例句 1 Because the first caving of work face haven't been finished, the tunnel roof and hole can not be used and gas often goes beyond the limit, so some measures must be taken. 由于工作面初次放顶没有完成，顶板巷道、顶板钻孔等不能发挥作用，常发生瓦斯超限现象，必须采取针对性措施。
随便看	schedule repair schedule repair schedule risk scheduler message block scheduler module schedule rotation sstem scheduler program scheduler proposed-queue schedulers scheduler subsystem scheduler task scheduler waiting queue scheduler work area scheduler work area data set schedules schedule sailing time Schedules and Appointments schedule service Schedules,Fee schedule sheet schedule shutdown Schedules,Immunization schedules of concessions schedules of controlled substances schedule speed

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