It introduced the seven - layer coextrusion blown - film line for high barrier film.介绍了七层共挤高阻隔薄膜吹塑机组.Multilayer co - extrusion feedblock, allowing for coextrusion of up to 7 kinds of raw materials.多层共挤复合分配器, 最多达七种成份原料共挤复...
to pay your hydro bill付电费In today's practice , a substantial part of hydro - electricity orginates from reservoirs.今天, 很大一部分水电来源于水库.Water power schemes ( hydro - electric schemes ) are of two types, high dams or low...