The physical attributes of an in - service valve with dezincification includes a white powdery substance or mineral stains on its exterior surface 应用中的阀门出现脱锌现象的物理特征是，在产品表面出现粉状物质或矿物污点。
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The physical attributes of an in - service valve with dezincification includes a white powdery substance or mineral stains on its exterior surface 使用中的阀门出现失锌想象时的物理特征包括：在外表面出现白色粉末或矿物污点。
