The fundamental physics and the basic engineering principles of the process have remained largely inaccessible. 对于该过程的基本物理知识和基本工程原理,人们仍是不够十分了解的。
To improve polyester cotton cambric quality, its sizing prescription is optimized by using value engineering principle. 摘要为了保证涤棉细布的质量,降低浆料成本,采用价值工程原理优选了浆料配方。