The Laochang deposit is a large of Ag Pb polymetallic deposit controlled by a mineralization unit composed of upper limestone and lower volcanic rock.
澜沧老厂系受燕山期构造控制由上部灰岩与下部火山岩组成统一矿化体的银铅多金属大型矿床。
You can select the airfields, if there are any on the base, by using the unit group icons in the upper left corner.
你能选择飞机场，如果在基地上剩下任何东西，使用左上角的单位组图像。
The unit pressure in backward extruding hollow billet has been calculated by the slip line method and the upper bound method.
本文对空心件反挤的单位挤压力，采用滑移线法和上限法进行了计算。
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