部分包括四道问题；任选两道作答。每道题25分。

Section B has FOUR questions; answer TWO. Each question is worth 25 marks.

youdao

气压液动。五通方向控制阀。第2部分：任选电气连接器的安装接口面。

Pneumatic fluid power - Five-port directional control valves - Part 2 : mounting interface surfaces with optional electrical connector.

youdao

气压液动。五通方向控制阀。第2部分：任选电气连接器的安装接口面。

Pneumatic fluid power - Five-port directional control valves - Part 2 : mounting interface surfaces with optional electrical connector.

youdao