露天开采中除有用矿物外,还要采出大量的剥离物。剥离量和有用矿物量之比称为()
A.利用率
B.回收率
C.剥采比
参考答案:C
心理:承受
A.干扰:闹钟 B.信息:刺激C.睡眠:质量 D.消化:吸收
An unconscious person should NOT be().
A.placed in a position with the head lower than the body
B.given an inhalation stimulant
C.given something to drink
D.treated for injuries until conscious