Not having promoted the new digital camera successfully, the company should      its original marketing methods.

A．account for

B．reflect on

C．work out

D．call up

属于设备及安装单位工程概算的是( )。

A．一般土建工程概算

B．弱电工程概算

C．特殊构筑物工程概算

D．工器具及生产家具购置费用概算