听句子，缩写原文。（）

A．With such a big order, our side demands a discount which is 10% or over.

B．At least 10% of the expenses should be devoted to solving the problem.

C．Although we have spent much on the project, a 10% increase in our budget is necessary.

D．We asked for a 10% discount, which has caused all the trouble on our side.

在十字头式柴油机中活塞起导向作用，因而与缸套之间有侧推动N的作用。