Assumption shall（）on the basis of scanty information especially scanty radar information.

As a vessel changes course to starboard，the compass card in a magnetic compass（）.

A.remains aligned with compass north
B.also turns to starboard
C.first turns to starboard then counterclockwise to port
D.turns counterclockwise to port

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A system of reservoirs and connecting tubes in a gyro compass is called a（）.

A.spider element
B.mercury ballistic
C.gyrotron
D.rotor

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