A、immediately when the contact is noted on radar
B、only if the radar scope is watched constantly
C、after the contact has been marked at least twice
D、by an occasional glance at the radar
更多“The closest point of approach (CPA) of a contact on a relative motion radar may be determined（）.”相关的问题
A、closest point to approach B、close point to approach C、crossing point to approch D、coming point to approach
A、The period of time in which the set point and the control point coincide B、The periodic change between the set point and the control point C、The variable difference between the set point and the control point D、The constant difference between the set point and the control point
A、the pivot point and point of influence of wind in are not in alignment B、the pivot point and point of influence of wind in are in alignment C、the point of influence of wind moves depending on the profile of the ship presented to the wind D、the ship steams slowly in rough seas
A、remain in the vicinity of the vessel B、head for the closest land C、head for the closest sea-lanes D、get a majority opinion
A、Ration food and water supplies B、Search for survivors C、Determine position and closest point of land D、Check pyrotechnic supplies
A、A.The cargo's temperature is colder than the dew point of the air in the space B、B.The cargo's temperature is warmer than the dew point of the air in the space C、C.The dew point of the air in the space is lower than the dew point of the outside air D、D.All of the above
A、the center of the hydrodynamic forces acting on the underwater hull to resist the effect of the wind B、the point of influence of wind on the ship C、the pivot point D、the point on the ship's above-water structure upon which the whole force of the wind can be considered an act
A、small whirlpool B、smooth patch of water C、V-shaped ripple with the point of the V pointing downstream D、V-shaped ripple with the point of the V pointing upstream
A、V-shaped ripple with the point of the V pointing upstream B、V-shaped ripple with the point of the V pointing downstream C、small patch of smooth water on a windy day D、smoothing out of the vessel's wake
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