采取浮选煤样是为了分析浮选系统的工作情况，制定浮选药剂制度。
参考答案：对
— Have you watched Gravity, _______ the best film in 2013?
—Yes. It is a survival story _________ in space.
A．considered; setting
B．considered; set
C．considering; set
D．considering; setting
凝集反应
