某企业对一项工程的完成有三个方案，甲、乙、丙每个方案的获利情况如下表所示：问企业

已知函数f (x) = x³+ax²+bx+a²在x = 1处有极值为10，则f (2) = _____.

小明是一个红绿色盲，现在有7个绿球和4个红球，她能正确指出红球的可能性是______．

Not only ______to see me, but also he stayed for dinner, too.    [ ]

A. did he come        

B. he came    

C. does he come      

D. he comes

肺爆震伤属胸部（）

A.开放性损伤

B.闭合性损伤

C.减速伤

D.加速伤

E.贯通伤

At what speed was a train traveling on a trip when it had completed half of the total distance of the trip ？（）
(1)The trip was 460 miles long and took 4 hours to complete.
(2)The train traveled at an average rate of 115 miles per hour Oil the trip.

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．