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【单选题】
防烟排烟系统安装前检查主要对系统组件、材料、设备到场后，对其外观、规格型号、基本性能、严密性等进行检查。下列检查内容和要求不符合规定的是（）。A.
的材料品种、规格、厚度等应符合设计要求和国家现行标准的规定
B.
有耐火极限要求的的本体、框架与固定材料、密封垫料等必须为不燃材料，材料品种、规格、厚度及耐火极限等应符合设计要求和国家现行标准的规定
C.
电动防火阀、送风口和排烟阀（口）的驱动装置，动作应可靠，在平均工作压力下工作正常
D.
防烟、排烟系统柔性短管的制作材料必须为不燃材料
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举一反三
【单选题】Jimmy has been in the factory for two years___he left school.
A.
when
B.
since
C.
as soon as
D.
whether
【简答题】Jimmy has been a postman for the last ten years. He loves to talk to his wife in the evenings about the people he delivers to. He told her about Mrs Manne, the little old lady at number 24, who had al...
【简答题】Jimmy has been a postman for the last ten years. He loves to talk to his wife in the evenings about the people he delivers to. He told her about Mrs Manne, the little old lady at number 24, who had al...
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