Direction and control of production operations, paint, finishing and assembly operations of plas-tic component parts.

控制并导向塑料零配件的生产操作，涂漆，零件组装和组装操作。

With advances in material science and biomedicine. more and more importance has been attached to biodegradable polylactic acids (PLAs) composite.

综述了近年来聚乳酸类生物可降解高分子复合材料的研究进展。