哪种选矿方法的选别粒度下限最小。()
A、重选
B、磁选
C、浮选
参考答案:C
—Whose digital camera is this? Is it Tom's?
—No, it's not _______. It's Jane's. [ ]
A. his
B. him
C. hers
D. her
为什么拆卸液力偶合器时脸部应躲开喷液方向?