round pit timber; technical quality and delivery requirements 矿山坑道用圆木.技术质量和交付要求
method of specifying the technical quality of coke for use in blast furnaces 高炉用焦炭技术质量的规定方法
technical quality assurance 技术质量保证
technical quality control 技术质量控制
with their technical qualities and the attractive price level, they are suitable for oem applications with mean and high quantities 它的工艺质量高,价格吸引人,适用于价格低数量大的oem使用。