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在控制等级中，TCS是PLC的下级（）

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Safety inspection

简述热加工变形的优点？

Every year, about 10 million of the 150 million workers in the European Community are affected by incidents,” accidents” or diseases at work.

According to UK official statistics, every year about 2000 lives are lost through occupational disease or injury, about 20,000 major industrial injuries occur （e.g. skull fracture, loss of sight） and