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[单选] You are approaching a vertical lift bridge.You know the span is fully open when().

A . Three white lights in a vertical line are lit
B . A red light starts to flash at about 60 times a minute
C . A yellow light is illuminated on the bridge pier
D . There is a range of green lights under the lift spa

()负责制定全国统一的国库监督管理基本规定和国库会计核算监督办法。 中国人民银行。 证监会。 国务院。 银监会。 交接班时应检查BSJ-2200微机监控系统的哪些内容? 工序是生产过程最基本的组成单位,工序划分主要是()。 考虑各工序之间的平衡。 人为划分,可粗可细,依生产需要而定。 考虑劳动分工和企业生产规模。 用户组织的文件称为()。 Which is false about engine trials?() engine trails should be done after finishing the operation of turning the engine with the turning gear and starting the engine on air briefly。 in the operation of engine trails, the main engine should be running in low-speed。 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。 the order “engine trials” should be given by the bridge。 You are approaching a vertical lift bridge.You know the span is fully open when().
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