单选题Which of the following procedures decreases the total dissolved solids concentration in the water of an auxiliary boiler?（）AHydrazine treatment of condensateBFrequent compoundingCChemical cleaningDBottom blowing
单选题
Which of the following procedures decreases the total dissolved solids concentration in the water of an auxiliary boiler?（）
A
Hydrazine treatment of condensate
B
Frequent compounding
C
Chemical cleaning
D
Bottom blowing
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