【单选题】
氧气是一种___
A. 可燃气体
B. 助燃性气体
C. 惰性气体
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答案
B
解析
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关于固定式排烟罩,下列说法错误的是___
A. 这类排气装置有侧抽、上抽和下抽三种
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C. 加强焊工个人防护,工作时戴防护口罩
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