n. return pipe
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蒸发气回流管是否已接通？
Has a vapour return line been connected?
youdao
制冷时细铜管为压缩机的输出管，粗的时回流管。
Fine copper tube for the output of the compressor pipe cooling, thick return line.
如果蒸发气回流管已接通，有关操作参数是否已经协议？
If a vapour return line is connected, have operation parameters been agreed?
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