求翻译：Certificates shall be obtained with manufacturer's performance and uniformity of tests on all admixtures. Results of manufacturer's performance and uniformity tests which relate to current supplies of the admixtures in use shall be made available on the basis of one uniformity test being carried out for each product each month, provided always that the manufacturer's production QC and ISO9001 QS records are available to support the claim of no change within the specified acceptance specifications tolerances.是什么意思？

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