矿产储量需准确或大致查明其空间分布、产状、形态、规模和质量符合当前工业生产()条件,或政策允许开发利用。
A、技术
B、经济
C、环保
D、选冶
参考答案:A, B
We have done things we ought not to have done and_____ undone things we ought to have done.
A.left
B.leave
C.will leave
D.leaving
消火栓箱体安装在轻体隔墙上应有加固措施。( )