他们受雇于机械，设备，汽车，汽车零部件，飞机及其他金属制品制造企业和机器加工车间。
They are employed by machinery, equipment, motor vehicle, automotive parts, aircraft and other metal products manufacturing companies and by machine shops.
主要清洗的工件：线路板、机械部件、金属产品、电子零件、光学镜片、塑胶产品、电镀前后清洗等。
Main cleaning workpiece: PCB, machinery parts, metal products, electronic components, optical lenses, plastic products, electroplating before and after cleaning, etc.
设备的零部件和金属构件发生的损坏，80%是由于各种微观和宏观机械应力集中所导致的疲劳失效。
The fatigue invalidation made by the kind of microcosmic and macroscopical mechanical stress concentrate 80% resulted in equipment part and metal components damage.
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