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andrewzhang

铁杆木虫 (著名写手)

超级无敌加菲

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huangguaha: 金币+200, 翻译EPI+1, ★★★★★最佳答案, 非常感谢~~ 2013-07-29 20:15:29

During the preparation of acids melange, the water should be filled into the pickling tank first, then the acid should be added slowly, to prevent the splash of the acid solution.
7.2 pickling treatment, every first manipulation of pickling treatment should proceed after a test of small sample on small surface of the material or other similar material
7.3 During the procedure of pickling, the operator should always be careful in observing the situation of the surface, in case of the surface of iron pipe been over corroded.

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