求翻译：所用砂石材料及水泥、外加剂应取样分析、检验, 经试验、试配后对材料质量提出明确要求, 设专人跟踪把关。原材料均采用经检验合格的材料, 未经检验的材料严禁用于工程, 施工时严格按设计配合比拌制。是什么意思？

Used for sand and gravel materials and cement, admixtures should be sampling and analysis, testing, and tested the quality of the material after the test with the explicit request, set up specifically to track checks. The raw materials are the materials have passed the test, the untested material is

The stone material and cement, admixtures, sampling and analysis should be inspected, tested, and try again with the quality of material by hand, with tracking. Raw materials are tested without a test of the material, the material used in the Agency, and do not strictly according to the design, cons

Uses the sand and crushed stone material and the cement, the admixture should take a sample the analysis, the examination, after the experiment, tries to match to the material quality proposed is clear about the request, supposes the specialist to track the check.Raw material uses after the examinat

Sampling analysis of gravel materials and cement, admixtures, inspection, after the test, the testing service make clear demands on material quality, maintain a set you will be tracking. Raw materials are used by qualified materials, material is strictly prohibited without the examination of project

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