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【单选题】
采用石灰石/石膏法净化烟气中SO2的工艺流程，在吸收塔实际操作过程中，一般控制浆液pH为( )A.
8-9
B.
5-6
C.
<4< /div>
D.
>9
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【单选题】With halting steps I paced the streets, and passed the ______ of The Crossed Harpoons—but it looked too expensive and jolly to dine at.
A.
character
B.
sign
C.
mark
D.
hoard
【单选题】With halting steps I paced the streets, and passed the ______ of The Crossed Harpoons--but it looked too expensive and jolly to dine at.
A.
character
B.
sign
C.
mark
D.
board
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