A、by which
B、through which
C、by that
D、through that
更多“VHF Radio is one of the very important navigational instruments on board，（）messages can be sent.”相关的问题
A、VHF communications are basically line of sight B、the air is more dense the higher you go C、salt water is a poor conductor of sound D、sea water absorbs the radiated energy
A、Radio checks and time checks B、Inter-vessel safety and search and rescue C、Working with helicopters D、Radio direction finding
A、A.All vessels capable of international voyages B、B.Vessels operating outside of the range of VHF coastal radio stations C、C.SOLAS Convention ships of 300 gross tonnage or more D、D.Coastal vessels of less than 300 gross tons
A、only one person may talk at a time B、only two persons may talk at the same time C、the radio only transmits D、the radio only receives
A、they can be used by mariners who do not know Morse code B、only an ordinary FM radio is necessary to receive these warnings C、information on a given topic is only broadcast at specified times D、they cover a broad spectrum of the radio band allowing reception on almost any type of receiver
A、radio communications that are available B、maximum speed of your vessel C、temperature D、current
A、Absence, substantial deterioration or failure of proper operation of the cargo deck area fire protection on tanker B、Absence, non-compliance or serious deterioration of lights, shapes or sound signal C、Absence or failure of proper operation of the radio equipment for distress and safety communication D、Absence in a watch of a person qualified to operate equipment essential to safe navigation, safety radio communications or the prevention of marine pollution
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