单选题:下列关于立式磨煤机安全控制措施的说法,正确的是(  )。

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题目内容:
下列关于立式磨煤机安全控制措施的说法,正确的是(  )。 A.检查煤粉喷吹设备时,应使用铁质工具
B.立式磨煤系统燃气炉点火,操作人员应面对炉门进行观察
C.袋式收尘器内着火,应立即紧急停止立式磨煤系统,加大主排风机,打开袋式收尘器进.出口调节阀
D.煤粉在煤仓中存放时间不允许超过8h
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