Automatic frequency of water supply equipment direct water-supply type, is the direct use of the municipal pipe network pressure to supply water directly.
全自动变频供水设备直接供水型,就是直接利用市政管网的压力直接供水。
In light of the problems occurred in manufacturing the high-pressure pipeline unions, the authors propose to treat the union by direct quenching through the use of the residual heat of forging.
针对石油钻采高压管线连接活接头生产中的问题,提出利用锻造余热直接淬火的形变热处理工艺。
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