When steam is being raised on a boiler, the water level will normally （）.<br>A:drop as the boiler warms up<br>B:rise as the boiler warms up<br>C:remain unchanged until the boiler is hot enough<br>D:rise and fall with the steam demand

When steam is being raised on a boiler, the water level will normally （）.
A:drop as the boiler warms up
B:rise as the boiler warms up
C:remain unchanged until the boiler is hot enough
D:rise and fall with the steam demand

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