In restricted visibility, a vessel which detects by radar alone the presence of another vessel shall determine if a close quarters situation is developing or risk of collision exists. If so, she shall().
A. sound the danger signal
B. when taking action, make only course changes
C. avoid altering course toward a vessel abaft the beam
D. All of the above
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()是一个纵向沟通网络,其中只有一个成员位于沟通内的中心,成为沟通的媒介。轮式沟通网络属于控制型网络,其中只有一个成员是各种信息的()与()。
在接触网没有停电并接地的情况下,()到蒸汽机车的锅炉上以及到内燃机车、电力机车和车辆的车顶上进行任何作业。