A.should be gradually increased
B.should be gradually reduced
C.should be constantly kept
D.should be varied up and down
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A.dividing walls
B.divided walls
C.dividing liners
D.divided jackets
A.water liner
B.wet liner
C.dry liner
D.drown liner
A.sea water
B.scavenging air
C.lubricating oil
D.fuel oil
A.jacket water
B.make-up water
C.boiler water
D.flushing water
A.the faster it will evaporate
B.the slower it will condense
C.the slower it will evaporate
D.the faster it will flow
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