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通航净空(tong hang jing kong )navigable clearance
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桥下净空应符合以下()规定。A、通航的河流,桥下净空宜符合通航标准的要求B、流放木筏的河流,桥下净空应符合流放木筏的要求C、跨下桥桥下净空,应符合被交叉公路、铁路、其他道路等建筑界限的规定D、桥下净空还应考虑排洪、流冰、漂流物、冰塞以及河床冲淤等情况
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单选题A bridge over a navigable waterway is being repaired. There is a traveller platform under the bridge’s deck that significantly reduces the vertical clearance. If required by the CG district commander,how will this be indicated at night?()A
Illumination by flood lightsB
A quick flashing red light at each lower cornerC
A strobe light visible both up and downstreamD
Fixed amber lights under the extreme outer edges of the traveller
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名词解释题通航净空
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