短語詞組短語valve spool travel 滑閥行程Valve GP -travel counterbalance 行走平衡閥縂成travel valve 行駛閥straight travel valve circuit 直駛閥油路straight travel valve 直駛閥travel valve operation 行駛閥的工作travel valve spool 行駛滑閥travel valve group 行駛閥組travel valve body 行駛閥躰 返回 valve travel