单项选择题
（）the repeater compass with the master compass，please.
A.Similize
B.Clock
C.Synchronize
D.Position
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单项选择题
My gyro-compass error is（）.
A.east two degrees
B.two degrees east
C.two east degrees
D.two-degrees east -
单项选择题
There is a possibility that small vessel，ice and other floating objects may not be（）by radar at an adequate range.
A.reflect
B.shown
C.detected
D.defected -
单项选择题
Which of the following radar contacts will present the most immediate danger?（）.
A.A vessel on the starboard bow whose bearing is changing and range is decreasing
B.A vessel on the starboard bow whose bearing is steady and range is increasing
C.A vessel on the port bow whose bearing is steady and range is decreasing
D.A vessel on the port bow whose bearing is changing to the left and range decreasing
