在矿床开采过程中，在采准矿量的基础上，全部完成了采矿方法所规定的切割工程量，能立即回采矿块（）中的矿量叫做（）。
参考答案：矿房；备采矿量
He said in his letter that he was going to visit China _____ and he had the idea ______. [ ]
A. long before ; before long
B. before long; long before
C. before long ; soon
D. before long ; before long
连三朵
