单选题Large pipes or （） are fitted between the steam and water drums to ensure good natural circulation of water.Afire-tubesBfurnacesCdown-comersDsoot-blowers
单选题
Large pipes or （） are fitted between the steam and water drums to ensure good natural circulation of water.
A
fire-tubes
B
furnaces
C
down-comers
D
soot-blowers
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