Can the construction worker’s certificate expire? Is it difficult for the quality inspector to take the exam?

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Can an individual hold two professional engineer titles at the same time? Hello.

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Water supply and drainage map reading, w / 7 and w / 10 mean, which is very simple for water supply and drainage specialty! W is the number of sewage outlet pipe.

If the registration certificate and professional title certificate can be hung separately at the same time.

Combination Plate Nut

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I need two papers on junior high school English Title Evaluation and publish them in nationally recognized journals.

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Professional titles cannot be attached at the same time.