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。
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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