基本解釋[機(jī)械工程]直琯螺紋詞組短語(yǔ)短語(yǔ)dryseal straight pipe thread 氣密直琯螺紋Dryseal straight pipe internal thread 乾密封燃油直琯螺紋straight pipe thread更多詞組專(zhuān)業(yè)釋義機(jī)械工程直琯螺紋