通常翻斗车铝或塑料制成。
可钻式封隔器以及桥塞等类似的工具一般都用铸铁、铝、塑料或类似的脆性材料制成。
Drillable packers, and similar tools such as bridge plugs, are typically made from cast iron, aluminum, plastic or similar brittle materials.
为原料的金属(铝或锌合金)是较昂贵的多次比同体积的材料在塑料。
As a raw material metal (aluminum or zinc alloy) is many times more expensive than the same volume of material in plastic.
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