单项选择题

Many of the lights on this coast are placed so high as to be frequently obscured by（）.

A.Power
B.Tower
C.Cover
D.Shower

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单项选择题

Lines drawn through points on the Earth having the same atmospheric pressure are known as （）.

A.Isothermal
B.Millibars
C.Isobars
D.Seismics

单项选择题

Light Lists for coastal waters are（）.

A.published every year and require no corrections
B.published every second year and must be corrected
C.published every five years and require no correction
D.accurate thru NM number on title page and must be corrected

单项选择题

Important changes to charts and lights（including temporary ones），radio signals and sailing directions are listed in（）.

A.Weekly Admiralty Notices to Mariners
B.The Mariners Handbook
C.Ocean Passages for the World
D.Symbols and Abbreviations used on Admiralty Charts，Chart 5011