When a boiler is operating, the water level in the gauge glass reads （） when the boiler is shut down.<br>A:lower than<br>B:higher than<br>C:as much as<br>D:the same as

When a boiler is operating, the water level in the gauge glass reads （） when the boiler is shut down.
A:lower than
B:higher than
C:as much as
D:the same as

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