According to the passage, it is recommended that the heat exchanger side be cleaned by .A.flushing with chemical solvent without being dismantledB.brushing mechanically after being disassembledC.flushing with flesh water onlyD.flushing with clean oil only
According to the passage, it is recommended that the heat exchanger side be cleaned by .
A.flushing with chemical solvent without being dismantled
B.brushing mechanically after being disassembled
C.flushing with flesh water only
D.flushing with clean oil only
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