单词	double-skin duct
释义	double-skin duct 双层管道
随便看	ultrasonic fuel oil treatment unit ultrasonic fusion joining ultrasonic fuze ultrasonic gage ultrasonic gap-measurement ultrasonic gas atomization ultrasonic gas bubble detector ultrasonic gas cavity ultrasonic gas flowmeter ultrasonic gauge Ultrasonic gear-honing ultrasonic gear lapping ultrasonic generator ultra sonic generator ultrasonic grader ultrasonic grating ultrasonic grating constant ultrasonic grind ultrasonic grinding ultrasonic grinding device ultrasonic grindingtechnique ultrasonic grinding technique ultrasonic guidance ultrasonic guide ultrasonic guidedwave