求翻译：施工现场的生产用物资必须持有生产许可证和产品合格证，对支架、脚手架、安全网等安全防护设施材料进行检验，确保安全生产。钢管、扣件材料必须从建委指定的生产厂家购进(租用)，重复使用前必须检验合格。是什么意思？

Construction materials production site must have a production license and product certification, the bracket, scaffolding, safety nets and other materials to test security facilities, to ensure safety in production. Steel, fasteners Construction materials must be specified by the manufacturer from t

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The job location production must have the production certificate and the product certificate with the commodity, to the support, the scaffold, the safety net and so on the safe safe guard material carries on the examination, guarantees the safety in production.The steel pipe, a buckle material must

Construction site materials must have a production license for the production and product certification, on the scaffold, scaffolding, safety nets and other materials for examination of security guards to ensure safety. Steel pipe, fastening material manufacturers must be specified from the construc

Construction materials production site must have a production license and product certification, the bracket, scaffolding, safety nets and other materials to test security facilities, to ensure safety in production. Steel, fasteners Construction materials must be specified by the manufacturer from t