短語(yǔ)詞組短語(yǔ)Free -semi-ball float steam trap 自由半浮球式蒸汽疏水閥Lever -ball float steam trap 進(jìn)口杠桿浮球式疏水閥;杠桿浮球式蒸汽疏水閥 返回 ball-float trap