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

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

出自：海船船员证

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