消防员灭火防护靴是消防员在灭火作业时用来保护脚部和小腿部免受水浸、外力损伤和热辐射等因素伤害的防护装备。
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Fuel oil is thought to be one of the main factors （） the operation and maintenance of an engine.
A. have nothing to do with
B. having nothing to do with
C. have much to do with
D. having much to do with
《公路水运工程施工企业项目负责人施工现场带班生产制度（暂行）》规定，公路水运工程施工企业应建立本企业项目负责人施工现场带班生产的责任考核制度，每（）至少组织1次对所承揽工程项目经理部的定期检查考核
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