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[单选] EICAS注意信息 FUEL JET SYS(燃油放油系统)什么时候显示?When will the EICAS caution message FUEL JET SYS display?
A.当总燃油量降低到少于所选择的剩余油量,且至少一个放油活门在开位时 When the total fuel is less than the fuel to remain B.当两个燃油放油控制系统都失效时 When both jettison control switches are failed C.当飞机在地面,且两个放油电门都在开位 When both jettison control switches are on with the airplane on the ground D.A和B A and B
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