At the same time, the feasible ore and rock haulage systems are, in detail, compared in respects of technological process, land requisition, capital investment, operation cost, etc.
同时，从工艺技术、征地、基建投资、运行费用等技术经济方面分别对可行的矿石和废石运输系统进行了详细的比较。
The composition and properties of plaster mould have been introduced, and the technological process and applied characteristics of plaster mould investment casting is discussed.
介绍了石膏原材料的组成和性能，阐述了石膏型熔模铸造的工艺过程。
The composition and properties of plaster mould have been introduced, and the technological process and applied characteristics of plaster mould investment casting is discussed.
介绍了石膏原材料的组成和性能，阐述了石膏型熔模铸造的工艺过程。
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