短語詞組短語heater drain valve hole 加熱器放水閥孔drain plug hole 排放螺塞孔number of drain -hole 泄油孔數(shù)量length of drain -hole 泄油孔長度Through -Drain-Hole water pouring test 通氣孔排水試騐drain hole cap 排水孔蓋deep drain hole 深層排水孔drain hole wood pad 排水孔墊木condensate drain hole 冷凝水排出孔 返回 drain hole