If in doubt as to the true water level when a boiler is being oil-fired you should _____.

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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

请帮忙给出正确答案和分析,谢谢!

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