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【简答题】
市场营销渠道存在的主要原因是( )。
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【单选题】Why should you wear a self-contained breathing apparatus before entering the engine room after the fixed CO2 system has been discharged to combat a major fine?
A.
Because carbon dioxide dilutes the oxygen concentration in the atmosphere and may cause as phyxiation.
B.
Because carbon dioxide breaks down in fire into carton monoxide which may cause blood poisoning in the person breathing this gas.
C.
Because carbon dioxide is a colorless and odorless gas that becomes highly toxic in the presence of high temperatures and will quickly incapacitate a person exposed to this gas.
D.
This action is unnecessary as carbon dioxide is neither poisonous nor toxic but is a relatively harmless gas.
【简答题】一张完整的零件图应包括一组图形、尺寸、___________、标题栏等内容。
【简答题】Why should you wear the gloves when operating the machine? In that way you may _________ any injury to your ________.
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