单项选择题

A.Separated lineB.Divided lineC.Reference lineD.Segrega……

A FICTIVE LINE DISPLAYED ON THE RADAR SCREEN SEPARATING THE FAIRWAY FOR INBOUND AND OUTBOUND VESSELS SO THAT THEY CAN SAFELY PASS EACH OTHER defines（）.

A.Separated line
B.Divided line
C.Reference line
D.Segregated line

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单项选择题A Doppler speed log indicates speed over ground（）.

A.at all times
B.in the bottom return mode
C.in the volume reverberation mode
D.only when there is no current

单项选择题A Doppler log in the volume reverberation mode indicates（）.

A.speed being made good
B.speed through the water
C.the set of the current
D.the depth of the water

单项选择题A Doppler log in the bottom return mode indicates the（）.

A.velocity of the current
B.bottom characteristics
C.depth of the water
D.speed over the ground

单项选择题A deadhead is a(n)（）.

A.tree or log awash in a nearly vertical position
B.crew member who refuses to work
C.upstream end of a land wall
D.buoy that is adrift

单项选择题A barometer showing falling pressure indicates the approach of a（）.

A.high pressure system
B.low pressure system
C.high dew point
D.low dew point