其四为改良土的技术经济对比分析，讨论了未改良土与改良土的工程造价情况，以及掺入不同改良剂在不同掺量下的造价。
At last, economic contrast analysis of meliorated soil, discuss engineering cost of unimproved, meliorated soil and different mixing of different improved stuffing.
本文介绍该新耐磨管材的生产工艺、产品性能、水力试验、技术经济对比和产品技术要求等情况，以利于设计选型及推广应用。
The production process, product performance, hydraulic test, technical and economic comparison and product technology requirement etc. of the new wear pipe m…
分析了丙烯生产技术的进展情况及发展趋势，对不同丙烯生产路线的技术经济性进行了对比分析。
The article analyzes advances in propylene production technology and its development trends and gives contrast studies on techno-economics of various propylene production routes.
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