John is the only one of the students in our class that never ________a mistake even when it is pointed out to him.

A．admit making

B．admits making

C．admit to make

D．admits to make

FMS（柔性制造系统）的形式分为从系统外部运进和在系统内部传送两种情况，其中从系统外部运进物料常采用（）的方法。

A.自动运输小车

B.驱动滚道

C.人工完成

D.机器人