單項選擇題

When latitude and longitude are used，these shall be expressed in（）（and decimals of a minute if necessary），north or south of the Equator and east or west of Greenwich.

A.Fathoms and meters
B.Miles and kilometers
C.Arc and degrees
D.Degrees and minutes

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單項選擇題

What is an ebb current（）.

A.A current at minimum flow
B.A current coming in
C.A current going out
D.A current at maximum flow

單項選擇題

What is a lighted safe water mark fitted with to aid in its identification（）.

A.A spherical topmark
B.Red and white retroreflective material
C.A sequential number
D.A red and white octagon