Large pipes or （） are fitted between the steam and water drums to ensure good natural circulation of water.<br>A:fire-tubes<br>B:furnaces<br>C:down-comers<br>D:soot-blowers

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

出自：海船船员证

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