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單項選擇題

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

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

單項選擇題

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