The comprehensive analysis on the superiority of direct-buried polyurethane insulating tube
直埋聚氨酯保温管优越性综合分析
it includes: the out oscillating flow tube, the inner oscillating flow tube, the thermal insulating block cover and the glass vacuum tube.
包括:外层振荡流热管、内层振荡流热管,保温堵盖、玻璃真空管。
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