单项选择题

The reaction of a gyrocompass to an applied force is known as（）.

A.precession
B.earth rate
C.gyroscopic inertia
D.gravity effect

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单项选择题

A.remove deviation on the intercardinal headings
B.remove deviation on the cardinal compass headings
C.remove heeling error
D.compensate for induced magnetism in vertical soft iron

单项选择题

The principal purpose of magnetic compass adjustment is to（）.

A.reduce the variation as much as possible
B.reduce the deviation as much as possible
C.reduce the magnetic dip as much as possible
D.allow the compass bowl to swing freely on its gimbals

单项选择题

The permanent magnetism of a vessel may change in strength due to（）.

A.a collision with another vessel
B.being moored on a constant heading for a long period of time
C.being struck by lightning
D.All of the above