航海英語地文航海單項(xiàng)選擇題每日一練(2019.01.17)

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
單項(xiàng)選擇題
Which statement concerning current is TRUE（）.
A.Current can be determined by measuring the direction and distance between simultaneous EP and DR positions
B.The drift of the current should be averaged out on a one hour basis
C.After the current is determined，it should not be used for further plotting because it is an unknown variable
D.The distance between a simultaneous DR position and fix is equal to the drift of the current
單項(xiàng)選擇題
（） is a defined area within which ships must use particular caution and should follow the recommended direction of traffic flow.
A.Recommended Direction of Traffic Flow
B.Roundabout
C.Separation Zone or Line
D.Precautionary Area
單項(xiàng)選擇題
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
單項(xiàng)選擇題
A bold reef is a reef（）.
A.with part of it extending above the water
B.that can be detected by water turbulence
C.that drops off sharply
D.perpendicular to the current

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