Between the steam dram and the smaller water dram below, large numbers of smaller diameter （） tubes are fitted.<br>A:fire<br>B:water wall<br>C:generating<br>D:down comer

Between the steam dram and the smaller water dram below, large numbers of smaller diameter （） tubes are fitted.
A:fire
B:water wall
C:generating
D:down comer

出自：海船船员证

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