单选题Diesel engine control can be obtained by the bridge （）.Aat any timeBonly after the engine room control station is switched to “bridge control”Cwhenever the secondary station is switched to bridge controlDwith the approval of the chief engineer only
单选题
Diesel engine control can be obtained by the bridge （）.
A
at any time
B
only after the engine room control station is switched to “bridge control”
C
whenever the secondary station is switched to bridge control
D
with the approval of the chief engineer only
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