Introduction of the selection procedure of control ball valve and butterfly valve and the empiric selection of the coefficient in calculation.
介绍了调节型球阀和蝶阀选用的步骤及计算中一些系数的经验取法。
Introduction of the selection procedure of control ball valve and butterfly valve and the empiric selection of the coefficient in calculation.
介绍了调节型球阀和蝶阀选用的步骤及计算中一些系数的经验取法。
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