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【单选题】
下列关于监视段压力说法错误的是（）。A. 在同一负荷(主蒸汽流量)下，监视段压力增高，则说明该监视段后通流面积减少，或者高压加热器停运、抽汽减少；B. 除了汽轮机最后一、二级外，调节级压力和各段抽汽压力均与主蒸汽流量成正比变化；
A.
在同一负荷(主蒸汽流量)下，监视段压力增高，则说明该监视段后通流面积减少，或者高压加热器停运、抽汽减少；
B.
除了汽轮机最后一、二级外，调节级压力和各段抽汽压力均与主蒸汽流量成正比变化；
C.
监视各监视段压力没有任何意义；
D.
监视监视段压力对于保证机组安全、经济运行有一定积极作用。
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参考解析：
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【单选题】在给水自动三冲量中，()是前馈信号，它能有效地防止由于“虚假水位”而引起调节器的误动作，改善蒸汽流量扰动下的调节流量。
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