It was brave ________him to jump into the river to save the child and it’s important

________ him to help others.

A．for; for

B．of; of

C．for; of

D．of; for

在海上平台的控制系统中PLC表示为（）系统。

A、自由调节

B、过程控制

C、集散控制

D、就地控制