单词	lower coal group
释义	lower coal group 下组煤
随便看	diagonal connection diagonal construction tire diagonal construction tyre diagonal continued fraction diagonal control diagonalcornerfiring diagonal corner firing diagonal corner tangential firing diagonal covariance matrix diagonal crack diagonal cracking diagonal cracking strength Diagonal crack of web plate diagonal crack width diagonal crossed diagonal crossing diagonal crossing area diagonal crossing bridge diagonal cubic surface diagonal cut diagonal cut gap diagonal cut joint diagonal cut piston ring diagonal cut rock drill plus bits diagonal cut sail