在浮选工艺的可调节因素中，（）对浮选指标有着决定性作用。
A、浮选时间
B、磨矿细度
C、药剂制度
D、浮选流程
参考答案：C
精加工或半精加工时，希望选取正的刃倾角，使切屑流向待加工表面而不划伤已加工表面。( )
—What's the matter with Tom?
—A letter from his wife ______ an attack of homesickness.[ ]
A. held up
B. reached out
C. picked up
D. set off
