A stand-on vessel in a crossing situation is allowed to take action when ().
A. on a collision course
B. the vessels will pass within one mile
C. it becomes apparent to her that the give-way vessel is not taking appropriate action
D. the relative speed of the vessels indicates collision in less than six minute
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增加燃气轮机装置的比功和有用功系数可以从哪些方面着手?
左联时期进行了几次“文艺大众化”讨论?主要收获是什么?
液氨、液化石油气及其它易燃易爆介质,卸液时不得用()加压。