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LPG storage tank raw material production

① The external commissioner does not evaluate subcontractors, and does not file with the certification organization: ② There are no rules and regulations for experimental methods in the physical an...
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① The external commissioner does not evaluate subcontractors, and does not file with the certification organization: ② There are no rules and regulations for experimental methods in the physical and chemical entrustment letter; ③ When purchasing materials, only steel grades or grades are given without specific requirements, such as no sulfur and phosphorus content rules.

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