If in doubt as to the true water level when a boiler is being oil-fired, you should （）.<br>A:take no measures<br>B:extinguish the fire as soon as possible<br>C:feed water to the boiler<br>D:open the blow down valve

If in doubt as to the true water level when a boiler is being oil-fired, you should （）.
A:take no measures
B:extinguish the fire as soon as possible
C:feed water to the boiler
D:open the blow down valve

出自：海船船员证

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