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

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B.published every second year and must be corrected
C.published every five years and require no correction
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单项选择题Important changes to charts and lights（including temporary ones），radio signals and sailing directions are listed in（）.

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For details of these and other lights the larger scale ...

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航海出版物

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