Water level controllers of the boiler must be kept operable to protect external steam-using plant from water “（）” danger.<br>A:carry off<br>B:carry down<br>C:carry on<br>D:carry over

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

出自：海船船员证

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