单选题Fusible plugs are installed in fire-tube boilers to （）.Aprovide a means of draining the boilerBwarn the engineer of low water levelCcool the crown sheet at high firing ratesDopen the burners electrical firing circuits
单选题
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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