A、A.carry off
B、B.carry down
C、C.carry on
D、D.carry over
更多“Water level controllers of the boiler must be kept operable to protect external steam-using plant from water “（）” danger.”相关的问题
A、higher than the actual drum water level B、equal to the actual drum water level C、increasing due to steam condensation in the glass D、lower than actual drum water level
A、suction pressure regulator B、thermostatic bypass valve C、sea water temperature D、water level in the expansion tank
A、the oil content in water B、the water content in fuel oil C、the water level in bilge well D、the oil level in bilge well
A、the oil content in water B、the water content in fuel oil C、the water level in bilge well D、the oil level in bilge well
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A、improper venting of the cooling system B、carrying the expansion tank water level too high C、a totally clogged impeller in the cooling water pump D、an incorrectly set cooling system temperature control
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