In a （） boiler the water flows through the inside of the tubes while the hot gases pass around the outside.<br>A:water-tube<br>B:fire-tube<br>C:exhaust gas<br>D:none of the above

In a （） boiler the water flows through the inside of the tubes while the hot gases pass around the outside.
A:water-tube
B:fire-tube
C:exhaust gas
D:none of the above

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