单选题In a （） boiler the hot gases from the furnace pass through the tubes while the water is on the outside.Awater-tubeBfire-tubeCexhaust gasDNone of the above is true
单选题
In a （） boiler the hot gases from the furnace pass through the tubes while the water is on the outside.
A
water-tube
B
fire-tube
C
exhaust gas
D
None of the above is true
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