－I wonder if I'm lucky enough to get that job.

－I'm afraid not, because it        special skills and much patience.[ ]

A. calls for                

B. calls out

C. calls up                

D. calls on

密封油压应（）氢压，以防空气进入发电机内或氢气充满汽轮机的油系统中引起爆炸。

A.接近；

B.大于；

C.小于；

D.等于。