During the starting process, due to the injection mould machine demoulding, carbonizing materials mixed into the injection materials of white base to form the blackspot in the picture.
在开机过程中，由于注塑件的脱模，碳化的物料混入白底座的注塑料内，造成了照片中的黑点。
WHO develops and updates a series of evidence-based resource materials on best practices for injection safety, waste management, health care worker protection and infection control.
世卫组织编制和更新了一系列基于证据的资源材料，涉及注射安全、废弃物管理、卫生保健工作者保护和感染控制等方面的最佳做法。
The formulation, the technological conditions and the product properties of polyurethane materials for low density long fiber injection (LFI) process were studied.
对低密度长玻璃纤维注射工艺(LFI)用聚氨酯材料的配方、工艺条件和制品性能进行了研究。
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