The finite element model of hydro - mechanical deep drawing is established based on the commercial software DYNAFORM - PC.采用商用有限元软件DYNAFORM-PC,建立了筒形件液压 - 机械拉深过程数值模拟模型....
若是不能及时把积雪从道路上清理走, 就会被压实,给车辆行驶带来困难.If the snow isn't cleared from the roads quickly, it packs down hard and makes driving difficult.水道内由不可压实的砂或砂砾物质充填.The channel is filled with noncompactible sand, or with sand and g...