单选题When a boiler is operating, the water level in the gauge glass reads （） when the boiler is shut down.Alower thanBhigher thanCas much asDthe same as
单选题
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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