The engineers are so busy that they have zero time for outdoor sports actives, _____ they have the interest. [ ]

A. wherever

B. whenever

C. even if

D. as if

( )是指一定时期内由投资而增加的固定资产价值与同期投资完成额之间的比较。

A．投资效益系数
B．建设周期
C．生产性投资效益系数
D．固定资产交付使用率