第四部分---真题49-56期及答案.doc

航海英语49期试卷代号 903 1. You may find the time of slack water after low water in a certain port from _____ A.Deadweight scale B.Tide table C.Notice to mariners D.Table of azimuth KEY: B 2. Many of the lights on this coast are placed so high as to be so frequently obscured遮掩 by ________ A.Power B.Tower C.Cover D.ShowerKEY: D 3. A line of position船位线from a celestial obsertion天体观测is a segment of a ______ (1890:131) A. circle of equal altitude等高圈 B.parallel of declination C.parallel of altitude D.vertical of circle KEY: A 4. How long would 15 minutes of longitude be at a latitude of 60 degrees North? ____ (154:14) A.30nm B. 60nm C.15nm D.7.5nm KEY: D 5.The maximum difference between mean time平时 and apparent time视时 is ______(1890:1091) A. equal to the longitude expressed in time units B. about 16 minutes C. the difference between the GHA of mean sun and the first point of Aries D. 15°of arc KEY: B 6. The chart of a beach area shows a very flat slope 平缓坡度to the underwater beach bottom. What type of breakers碎波器 can be expected when trying to land a boat on this beach? Surging B. Spilling溢型 C. Plunging D. ConvergingKEY: B 7. Which is a weekly publication advising mariners of important matters affecting navigational safety? A. Light List B. Notice to Mariners C. Coast Pilot D. Sailing Directions KEY: B 8.Navigate with ___. Small fishing boats are within 0.8 mile of me. A.crefull B.skill C. concern D.caution KEY: D 9. The Admiralty Notices to Mariners can be obtained ___ by Masters of vessels from any Admiralty Chart Agent． A. free of charge B. with no responsibility C. without limitations of distribution D. with little chargesKEY: A 10. The proper way to correct a mistake in the logbook is to ____. (1890:1148) A. erase the entry and rewrite B. draw several lines through the entry，rewrite，and initial the correction C. completely black out the entry，rewrite，and initial the correction D. draw one line through the entry