單項(xiàng)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


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1.單項(xiàng)選擇題What describes a flood current（）.

A.Horizontal movement of the water toward the land after high tide
B.Horizontal movement of the water toward the land after low tide
C.Horizontal movement of the water away from the land following high tide
D.Horizontal movement of the water away from the land following low tide

2.單項(xiàng)選擇題What area of the earth cannot be shown on a standard Mercator chart（）.

A.Equator
B.Areas including both North and South latitudes
C.North and South Poles
D.A narrow band along the central meridian

3.單項(xiàng)選擇題Traffic separation schemes adopted by the IMO are listed in（）.

A.NM
B.Ship's Routing
C.Colreg
D.Solas

5.單項(xiàng)選擇題The recording fathometer produces a graphic record of the（）.

A.bottom contour only up to depths of 100 fathoms
B.depth underneath the keel against a time base
C.contour of the bottom against a distance base
D.depth of water against a distance base