A、which
B、on which
C、at which
D、in which
更多“The frequency（）the safety message will be transmitted shall be included in DSC safety call.”相关的问题
A、slightly less than the line frequency B、the same as the line frequency C、slightly greater than the line frequency D、All of the above
A、higher than the bus frequency B、lower than the bus frequency C、the same as the bus frequency but out of phase with it D、the same as the bus frequency and the circuit breaker may be closed at any pointer position
A、slightly less than the oncoming generator frequency B、the same as the bus frequency C、slightly greater than the bus frequency D、the same as the bus voltage
A、Calling frequency B、Distress frequency C、Urgency frequency D、Working frequency
A、higher than the bus frequency B、lower than the bus freouencv C、the same as the bus frequency but out of phase with it D、the same as the bus frequency, and the circuit breaker may be closed at any pointer position
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、Vessel's Hoisting Flag B、Very High Safety C、Vessel's Homing Frequency D、Very High Frequency
A、double frequencies B、single frequency C、dedicated frequency D、multiple frequencies
A、A.After determining that the frequency or channel appears to be no longer in use B、B.After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communications C、C.After the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded D、D.Routine communications can resume if，in the Master's opinion，communications on that frequency or channel will not interfere with emergency communications
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