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單項(xiàng)選擇題

（）the repeater compass with the master compass，please.

A.Similize
B.Clock
C.Synchronize
D.Position

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單項(xiàng)選擇題

My gyro-compass error is（）.

A.east two degrees
B.two degrees east
C.two east degrees
D.two-degrees east

單項(xiàng)選擇題

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