基本设备费的计费基础是( )之和。

A．设备及工器具购置费，

B．建筑安装工程费

C．建设期利息

D．流动资产投资

E．工程建设其他费用

All trainees in a certain aviator training program must take both a written test and a flight test, If 70 percent of the trainees passed the written test, and 80 percent of the trainees passed the flight test, what percent of the trainees passed both tests ？（）
(1)10 percent of the trainees did not pass either test.
(2)20 percent of the trainees passed only the flight test.

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．