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【单选题】
在大型油船辅锅炉双冲量水位控制系统中,当锅炉负荷变化时,其控制过程是——。
A.
先控制给水阀开度,再控制蒸汽阀控制蒸汽水泵,确保给水流量t
B.
先控制给水阀开度,再控制蒸汽阀控制蒸汽水泵,确保给水压力
C.
先控制控制蒸汽阀控制蒸汽水泵,再给水阀开度,确保给水流量
D.
先控制控制蒸汽阀控制蒸汽水泵,再给水阀开度,确保给水压力
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