【正文】 s IMMEDIATE reply should be ______. A. Aye Aye Sir B. Right 15 degrees rudder C. Rudder is right 15 degrees D. No reply is necessary， just carry out the order KEY: B [429]A jackup drilling rig being towed must ______. A. turn off all lights that interfere with the navigation lights B. turn on all available working lights on deck C. ring the bell rapidly for five seconds once a minute D. display two black diamonds in a vertical line during the day KEY: A [430]A jackup drilling unit elevated on the Outer Continental Shelf must have a fog horn that will sound ______. A. a 2second blast every 20 seconds B. a 4second blast every 20 seconds C. an 8second blast every 30 seconds D. a 10second blast every 30 seconds KEY: A [431]A large basin cut into the shore， closed off by a caisson， and used for dry docking of ships is known as a ______. A. slipway B. graving dock C. ground warp D. caisson dock KEY: B [432]A large metallic device， mounted directly in the piping (usually located at the dock near the point where the vapor hose is attached)， designed to prevent the passage of a rapidly moving flame through the piping is called a ______. A. flame arrestor B. flame screen C. detonation arrestor D. detonation blocker 。s stability underway by ______. A. increasing the righting moment B. decreasing the vessel39。t reduce the vessel39。S TWO KINDS OF CERTIFICATES HAVE EXPIRED. ONE IS DERATING CERTIFICATE AND THE OTHER IS SAFETY EQUIPMENT CERITFICATE. According to this telex， ______. A. two certificates have expired B. two certificates will expire C. one of the two certificates have expired D. one of the two certificates will expire KEY: A [403]______ any case or suspected case of quarantinable disease， or any case of eruptive disease or any death be discovered， the local quarantine officer must be notified immediately． A. If B. Shall C. Should D. Whether KEY: C [404]______ any person died on board during the voyage otherwise than as a result of accident？ A. Have B. Has C. Has there been D. Are there KEY: B [405]______ any sick person on board now apart from the abovementioned cases？ A. Have B. Has C. Is there D. Are there KEY: C [406]______ day， pilot flag should be displayed from main mast． A. From B. By C. on D. With KEY: B [407]______ during the voyage any case or suspected case of plague， cholera， yellow fever，smallpox， typhus or relapsing fever？ A. Has there been B. Have there been C. Has there D. Have there KEY: A [408]A decrease in barometric pressure is associated with all of the following except ______. A. rising warm air B. proximity to a low pressure area C. inward spiraling circulation D. clear dry weather KEY: D [409]A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a flame ______. A. stopper B. screen C. filter D. restrictor KEY: B [410]A disadvantage of using chain lashing on heavy vehicles aboard RoRo vessels is that it is ______. A. heavy B. easily damaged C. affected by temperature D. costly relative to the strength ratio KEY: A [411]A Doppler speed log indicates speed through the water ______. A. at all times B. in the bottom return mode C. in the volume reverberation mode D. only when there is no current KEY: C [412]A drawbridge may use visual signals to acknowledge a vessel39。s Handbook D. Admiralty Notices to Mariners KEY: D [313]______ is not contained in the NM Weekly. A. Amendments to Admiralty Sailing Directions B. Amendments to Admiralty List of Lights and Fog Signals C. Amendments to Admiralty List of Radio Signals D. Supplement to Guide to Port Entry KEY: D [314]The heights and soundings of Admiralty chart are expressed ______ in Fathoms ______ in Meters． A. either， or B. neither， nor C. another， nor D. other， or KEY: A [315]______ day， pilot flag should be displayed from main mast． A. From B. By C. on D. With KEY: B [316]______ objects are those which stand out clearly from the background or other objects and are easily identifiable from a few miles offshore in normal visibility． A. Conspicuous B. Permanent C. Preliminary D. Temporary KEY: A [317]A marker pole， with a horseshoe buoy and a sea anchor attached， should be used to ______. A. mark the position of a lost mooring B. determine your vessel39。s Handbook C. Catalogue D. Sailing Directions KEY: A [309]Contour elevations on this chart refer to heights in feet above mean ______. A. lower low water B. high water C. low water D. sea level KEY: D [310]Charts are subject to frequent correction according to ______. A. Notices to Mariners B. Mariner39。s lounge C. in the upper pumproom flat D. where they can be easily seen or readily available KEY: D [191]There shall be two principal ______ through the harbor for the passage of vessels of over 60 tons burden． A. straits B. channels C. canals D. roadsteads KEY: B [192]Vessels must ______ pilot at waiting anchorage． A. wait B. wait for C. be waited D. be waited for KEY: B [193]When a pilot is on board to pilot the vessel the Letter ______ must be hoisted． A. G B. H C. B D. N KEY: B [194]When a tug is pulling on a hawser at right angles to the ship， and the pilot wants to e ahead or astern on the ship39。t he KEY: D [182]The pilot motor launches are ______ blue， with the PILOT in white． A. furnished B. painted C. prepared D. written KEY: B [183]The pilot said he ______ our vessel directly to the be