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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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单选题A high temperature alarm or （） which will melt is used to guard against the explosion of compressor air pipelines.A
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考题
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Prime the engine with ether through spark plug openingsD
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