船用齿轮控制操作
marine gear control operation
船用齿轮控制阀
marine gear control valve
船用齿轮方向控制阀
marine gear directional control valve
船用齿轮选择器阀
marine gear selector valve
船用齿轮图示号
marine gear illustration number
船用齿轮油温度
marine gear oil temperature
船用齿轮油温度读数
marine gear oil temperature reading