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
点击查看答案&解析
相关考题
-
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 -
单项选择题
The four standard light colors used for lighted aids to navigation are red，green，white，and （）.
A.purple
B.orange
C.blue
D.yellow -
单项选择题
The equator is（）.
A.the primary great circle of the Earth perpendicular to the axis
B.the line to which all celestial observations are reduced
C.the line from which a celestial body's altitude is measured
D.All of the above
