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The corrosion resistance of metal type needle valve
###22:39 泉源：
Corrosion of needle valve type, type is often understood as needle valve metal materials in the chemical or electrochemical environment under the action of the damage. Because "corrosion" phenomenon appeared in the metal and the surrounding environment of spontaneous interaction, how the sample will be deprived or more of the metal and the surrounding environment using non-metallic composite material, is the key point of anti-corrosion.
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