Fusible plugs are installed in fire-tube boilers to （）.<br>A:provide a means of draining the boiler<br>B:warn the engineer of low water level<br>C:cool the crown sheet at high firing rates<br>D:open the burners electrical firing circuits

Fusible plugs are installed in fire-tube boilers to （）.
A:provide a means of draining the boiler
B:warn the engineer of low water level
C:cool the crown sheet at high firing rates
D:open the burners electrical firing circuits

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