单选题Water level controllers of the boiler must be kept operable to protect external steam-using plant from water “（）” danger.Acarry offBcarry downCcarry onDcarry over
单选题
Water level controllers of the boiler must be kept operable to protect external steam-using plant from water “（）” danger.
A
carry off
B
carry down
C
carry on
D
carry over
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