Fair and(1)competition in govemment procurement around the world is good business and good public policy.Competitive pricing,product(2)and performance improvements result from competitive practices and help ensure that government authorities get the best(3)for the public they serve.

空白（3）为（）

A.help

B.server

C.value

D.policy

对早期的滚翻式货舱盖而言，关舱前首先应做的工作是：（）

A.调整偏心滚轮

B.上好压紧装置

C.启动动力装置

D.整理好索具