单项选择题
A.过滤器B.气压稳定泵C.电磁阀D.检测扇形块
A.A100M-Y180B.A120M-Y181C.A130M-Y182D.A140M-Y183
A.泄压阀B.压力平衡开口C.补气装置D.平衡泵