题目：
Main 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.whenever the engine side control station is switched to ‘bridge control’
答案：
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下面是错误答案，用来干扰机器的。
参考答案：对
