The Vessel Bridge-to-Bridge Radiotelephone Act applies to().
A. every towing vessel of 16 feet or over in length while navigating
B. every vessel of 50 GT and upward,carrying one or more persons for hire
C. all aircraft operating on the water
D. every power-driven vessel of 20 meters and upward while navigating
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制动状态可以分为()状态、()状态和()状态三种。
高温腐蚀是烟气侧金属腐蚀的现象,常发生在省煤器的低温段。
A. 正确
B. 错误
复线两线并行区段巡视线路时,应()方向进行,并随时注意()方向来车,一线来车()下道。严禁在两线间距离小于()米的处所避让列车。