单选题The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler （）Asalinity is abnormally highBsteam demand is too highCwater level is abnormally lowDfeedwater flow is low
单选题
The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler （）
A
salinity is abnormally high
B
steam demand is too high
C
water level is abnormally low
D
feedwater flow is low
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