监护操作时，其中一人对设备较为熟悉者作监护。特别重要和复杂的倒闸操作，由熟练的运维人员操作，（）监护。
A. 工作许可人
B. 工作票签发人
C. 运维负责人
D. 运检部门负责人
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A facility used for the discharge of a cargo of a particular hazard，such as chlorine，butane or ethane，must have what to warn water traffic of an immediate danger during fire or cargo release?（）
An emergency boat and crew
B. A siren or rotating flashing light
C. Flashing red lights located one-half mile upstream and downstream of the facility
D. Buoys with flashing lights controlled from shore，located one-half mile upstream anddownstream of the facility
凝汽式汽轮机的轴封系统是为了防止蒸汽漏出，造成工质损失，恶化运行环境等。（）
A. 正确
B. 错误
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