(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．

If Beth spent $400 of her earnings last month on rent, how much did Beth earn last month
(1) Beth saved [*] of her earnings last month and spent half of the remainder on rent.
(2)Beth earned twice as much this month as last month.

无缝线路胀轨跑道无降温条件或降温无效时应怎么做？