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【简答题】
CO2气体保护焊的焊接参数有哪些？
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【简答题】33x906=
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Advantages and disadvantages of automation.
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【单选题】Which of the following can best sum up the passage?
A.
Advantages and disadvantages of automation
B.
Labor and the effects of automation.
C.
Unemployment benefit plans and automation.
D.
Social benefits of automation.
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