主要通过扩张静脉而治疗心衰的药物是（）

A.肼屈嗪

B.硝苯地平

C.硝酸甘油

D.硝普钠

E.哌唑嗪

What is the maximum capacity in cups of a pail that contains only sand and is filled to three fourths of its capacity ？（）
(1)If one cup of sand were added to the pail, it would be filled to seven eighths of its capacity.
(2)If two cups were removed from the pail, it would be filled to one half of its capacity.

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．