Water makes up some 70 percentage points of the body, and drinking enough water—either tap water or expensive mineral water—will ensure that the body is properly lubricated and flushed.

A．per-cent

B．per capita

C．percent

D．percentage

胶轮车发动机转速增高后，油压反而降低是因为（）。

A、机油限压阀弹簧弯曲

B、发动机损坏

C、漏油

D、油表损坏