工艺：四氟加热管它是由普通加热管的外层加四氟套管，在接线端用塑料接线盒加工而成。
Technology: tetrafluoroethane by ordinary heating regardless of the heating of the outer casing and tetrafluoroethylene in the terminal plastic junction box is processed.
工艺：四氟加热管它是由普通加热管的外层加四氟套管，在接线端用塑料接线盒加工而成。
Technology: tetrafluoroethane by ordinary heating regardless of the heating of the outer casing and tetrafluoroethylene in the terminal plastic junction box is processed.
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