John is the only one of the students in the class that never_____ a mistake even when it is pointed to him.

A．admit making

B．admits making

C．admit to make

D．admits to make

消防车利用分水器供水，消防车水泵出口压力为（）之和。

A、水枪喷嘴处压力

B、水带干线的压力损失

C、工作水带支线的压力损失

D、高差标

E、分水器压力损失