A、to be underway
B、on under way condition
C、to stop engine
D、in being under way
更多“In dense fog a vessel without operational radar may not be justified（）at all but should anchor if it is safe and practicable for her to do so.”相关的问题
A、dense fog and high humidity B、gusty winds，thunder，rain or hail，and lightning C、clear skies with the approach of a cold front D、a rapid drop in barometric pressure followed by darkness
A、PIM sparse - dense mode and PIM dense mode require an RP on the network. B、PIM sparse mode and PIM dense mode require an RP on the network. C、PIM sparse mode interfaces are always added to the multicast routing table in a router. D、PIM sparse mode and PIM sparse - dense mode require an RP on the network. E、PIM dense mode interfaces are always added to the multicast routing table in a router. F、PIM sparse - dense mode acts as PIM dense mode if an RP is not known.
A、greater range than high-velocity fog B、lesser range than high-velocity fog C、about the same range as high-velocity fog D、greater range than a solid stream
A、In positions in which the noises in the ship are least likely to interfere with the hearing of a fog signal and the man can see clearly B、In positions in which the noises in the ship are much likely to interfere with the hearing of a fog signal C、In positions in which the hearing of a signal is reduced to a minimum D、In a position in which the man can see clearly
A、warmer，less dense，and less stable B、cool，more dense，and drier C、muggy and cloudy D、extremely moist with high relative humidity
A、no fog signal B、one short blast C、one prolonged and three short blasts D、one prolonged，one short，and one prolonged blast
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