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当前学科：汽轮机设备及系统
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大容量机组汽机从3000转／分打闸后，高中低压胀差都有不同程度的向正值增大的现象，（）增幅较大。
A . A、高压缸（高中压缸）；
B . B、中压缸；
C . C、低压缸。
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