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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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单选题Large pipes or down-comers are fitted between the steam drum and （） to ensure good natural circulation of water.A
fire-tubesB
furnacesC
water drumsD
water wall tubes
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