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【单选题】
铝和氧化铁在高温下的反应中,铝是 [     ]
A.
氧化剂
B.
还原剂
C.
既不是氧化剂又不是还原剂
D.
既是氧化剂又是还原剂
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【简答题】My doctors (5)____________ that I would be (6)____________ deaf by now, so I think I’m doing pretty well.
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【判断题】为了保证偏心工件的工作精度,在车削偏心工件时,应特别注意控制轴线间的平行度和偏心距的精度
A.
正确
B.
错误
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【简答题】My doctors (5)____________ that
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