单项选择题

Mariners not entering the port are（）to keep at least one mile off.

A.Advised
B.Reported
C.Complied
D.Supplied

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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

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