短语词组短語peding return spring load 踏板廻位彈簧力pedal return ring load 踏板廻位彈簧力return load detail 廻程貨物cash on return load 廻船付款empty return load ratio 返程空載率load return period 荷載重現期minimum dead load output return 最小靜載荷輸出恢複 返回 return load