A、Immediately upon abandoning the vessel
B、Only when there is a chance of their being seen by a rescue vessel
C、At one hour intervals
D、At half hour intervals
更多“When should distress flares and rockets be used? （）”相关的问题
A、No action is necessary，as the DSC control unit will automatically switch to the NBDP follow-on communications frequency B、The operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was received C、The Operator should immediately set continuous watch on VHF channel 70 D、The Operator should immediately set continuous watch on the NBDP frequency that is associated with the frequency band on which the distress alert was received
A、Only when there is a chance of their being seen by rescue vessels B、At half-hour intervals C、At one-hour intervals D、Immediately upon abandoning the vessel
A、A.When the distress alert is sounded B、B.When the emergency equipment is switching on C、C.When the general emergency alarm is sounded D、D.When the distress broadcast is sounded
A、Channel 6 DSC B、Channel 6 Radiotelephony C、Channel 13 Radiotelephony and channel 16 DSC D、Channel 70 DSC
A、Channel 6 DSC B、Channel 6 Radiotelephony C、Channel 13 Radiotelephony and channel 16 DSC D、Channel 70 DSC
A、assist B、send a rescue vessel C、search the distress area D、reach the distress position at once
A、straight overhead B、at the vessel whose attention you are trying to get C、into the wind D、about 60 degrees above the horizon
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