单项选择题

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

A.make
B.be made
C.not make
D.not be made

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单项选择题

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

单项选择题

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

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

单项选择题

A single vertical magnet placed underneath the compass in the binnacle is used to compensate for（）.

A.the horizontal component of the permanent magnetism
B.deviation caused by the vessel's inclination from the vertical
C.induced magnetism in the horizontal soft iron
D.induced magnetism in the vertical soft iron