555.If you start just one engine, the pack does not operate until two minutes after the start The pack OFF light stays on during the two minutes ( )

　The pack OFF light may go off as soon as the engine starts.

　The pack should begin to operate two minutes after one engine starts.

　The pack starts to operate as the engine starts, but the pack OFF light stays on until two minutes after the start.

答案解析

正确答案：B

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