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【单选题】
在熔焊过程焊接区内产生的下列有害气体中,( )会造成人体组织缺氧而引起中毒。
A.
臭氧
B.
氮氧化物
C.
一氧化碳
D.
氟化氢
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A.
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B.
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C.
甘肃
D.
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A.
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B.
在-117度 时,酒精处于液态
C.
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D.
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A.
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B.
冰有一定的熔点 , 说明冰是晶体
C.
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D.
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