• (A) 条件(1)充分，但条件(2)不充分．
• (B) 条件(2)充分，但条件(1)不充分．
• (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
• (D) 条件(1)充分，条件(2)也充分．
• (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

Adult and children’s tickets were sold for the circus. If 100 adult tickets and 200 children’s tickets were sold, how much money was collected for ticket sales
(1) Two adult tickets and four children’s tickets cost $ 40.
(2) Adult tickets cost twice as much as children’ s tickets.

润滑轧制的优点有（）。

A.减少轧辊磨损，降低轧辊单耗

B.降低轧制力，减少电能的消耗

C.调节各机架的轧制速度，以保证连轧常数

D.改善轧辊表面状况，提高产品表面质量