单选题:下列关于通风.空调系统的防火防爆措施,说法正确的是(  )

题目内容:

下列关于通风.空调系统的防火防爆措施,说法正确的是(  ) A.输送有燃烧爆炸危险的气体.蒸汽和粉尘的排风系统,其排风设备可以布置在地下室
B.排出温度超过80℃的空气或其他气体的管道互为上下布置时,表面温度较低者布置在上面
C.空气中含有容易起火或爆炸物质的房间,其送.排风系统应采用防爆型的通风设备
D.接触腐蚀性介质的遁风.空气调节系统的风管.风机等设备材料燃烧性能不得低于B1级

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