The fog is lifted，so ______ the radar．A.closeB.openC.switch offD.switch on
The fog is lifted，so ______ the radar．
A.close
B.open
C.switch off
D.switch on
相关考题：
Dense fog comes with bad visibility, fog signal bell must be kept ________at regulation intervalsA.to goB.goingC.goesD.go
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．A.to be underwayB.on under way conditionC.to stop engineD.in being under way
A mobile offshore drilling unit under tow is approaching a fog bank. When should fog signals be started?A.When the towing vessel enters the fogB.When the drilling rig enters the fogC.When the towing vessel can no longer be seen from the rigD.Immediately
单选题A mobile offshore drilling unit under tow is approaching a fog bank. When should fog signals be started? （）AWhen the towing vessel enters the fogBWhen the drilling rig enters the fogCWhen the towing vessel can no longer be seen from the rigDImmediately
单选题The ship should reduce speed in the thick fog because of（）.Athe poor visibilityBthe fog signalsCthe fast speedDthe good sight
单选题What is the use of the books of Admiralty List of Lights and Fog Signals? Their use is to （）.AMention signal stations and ice，storm，traffic and port signalsBGive the international numbers of lightsCGive the correction of the lights and fog signalsDGive the information on the lights and fog signals
单选题Advection fog holds longest over which portions of the lakes? （）ANorthwestBSoutheastCNortheastDSouthwest
单选题The fog most commonly encountered at sea is called（）.Aconduction fogBradiation fogCfrontal fogDadvection fog
单选题The all-purpose nozzle will produce a fog spray when you（）.Apull the nozzle handle all the way back toward the operatorBpull the nozzle handle back to a position where the handle is perpendicular to the plane of the nozzleCpush the nozzle handle forward as far as it will goDinsert a fog applicator between the fire hose and nozzle
单选题High-velocity fog（）.Ais a finer，more diffuse water spray than low-velocity fogBrequires that the water pressure be no greater than 60 psiCproduces an effective fog pattern no more than 6 feet beyond the nozzleDextinguishes a fire by absorbing heat and reducing the supply of oxygen
单选题A tug is towing three manned barges in line in fog. The first vessel of the tow should sound （）.Ano fog signalBone short blastCone prolonged and three short blastsDone prolonged，one short，and one prolonged blast
单选题Before personnel are lifted from a vessel in a personnel basket，the vessel should be（）.Adirectly under the boomBmoving away from the boomCstopped dead in the waterDtied to the boom
单选题An instrument useful in predicting fog is the（）.Asling psychrometerBmicrobarographCanemometerDaneroid barometer
单选题Which kind of fog is also named as ground fog?（）AAdvectionBRadiation fogCfrontal fogDSteam fog
单选题（）gives listings of all lighthouses，lightships，lit floating marks（over 8m in height），fog signals and lights of navigational significance.AOcean Passages for the WorldBAdmiralty List of Radio SignalsCIALA Maritime Buoyage SystemDAdmiralty List of Lights and Fog Signals
单选题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.Ato be underwayBon under way conditionCto stop engineDin being under way
单选题A combination or all-purpose nozzle produces（）.Alow-velocity fog onlyBa solid stream onlyCa solid stream and foamDa solid stream and fog
单选题Cargo handling unit is rated according to the （） to be lifted.Acargo craneBjibCsafe working loadDoil pressure
单选题There was a heavy fog this morning，so none of the planes could _____.Aget throughBtake offCpull outDbreak away