单选题When a sudden increase in steam demand occurs from the boiler, the water level in the drum at the higher pressure will（）Arise quicklyBrise slowlyCdrop quicklyDdrop slowly
单选题
When a sudden increase in steam demand occurs from the boiler, the water level in the drum at the higher pressure will（）
A
rise quickly
B
rise slowly
C
drop quickly
D
drop slowly
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