[单选] Which is false about engine trials?（）

A . engine trails should be done after finishing the operation of turning the engine with the turning gear and starting the engine on air briefly
B . in the operation of engine trails, the main engine should be running in low-speed
C . As to the ship equipment with twin main engine, engine trials should be done with one engine ahead and another engine astern at the same time
D . the order “engine trials” should be given by the bridge

斯彭斯的贡献突出体现在他对辨别学习、（）和对诱因动机作用的研究。米勒认为反应是有机体所发生的一切行为。概念学习。关系反应的调换。规则的学习。问题解决的学习。 You are approaching a vertical lift bridge.You know the span is fully open when（）. Three white lights in a vertical line are lit。 A red light starts to flash at about 60 times a minute。 A yellow light is illuminated on the bridge pier。 There is a range of green lights under the lift spa。与特殊紧急情况，如何解锁操作？对风险预警内容未消除的，超过规定期限后，由（）各职能部门予以解除。消保、市场部门予以解除。监管部门予以解除。软件自动予以解除。（）集中收付代理银行资格认定的评定指标、程序和结果应当公开。中央财政国库。地方财政国库。中央财政国库和地方财政国库。 Which is false about engine trials?（）

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[单选] Which is false about engine trials?（）

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