单项选择题

Traffic separation schemes adopted by the IMO are listed in（）.

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

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单项选择题

The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the（）.

A.Set
B.Frequency
C.Period
D.Function

单项选择题

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

单项选择题

The points on the earth’s surface where the magnetic dip is 90° are（）.

A.Along the magnetic equator
B.Connected by the isoclinal line
C.The isopors
D.The magnetic poles