A.a heater
B.a pre-heater
C.an exhaust gas boiler
D.the coal burning boiler
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A.be increased
B.be decreased
C.remain constant
D.either be increased or remain constant
A.the more
B.the higher
C.the lower
D.the highest
A.monkey
B.donkey
C.waste heat
D.main
A.fire
B.water wall
C.generating
D.down comer
A.tightened up
B.sealed up
C.opened up
D.unscrewed
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