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If center of gravity of three-freedom gyroscope and fulcrum overlap, it is called ______ .

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______ is a rigid body rotating about the symmetrical axis of a wheel rapidly.

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Gyroscope consists of gyro, inner ring, outer ring and______ .

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The law of apparent motion of gyrocompass is North Latitude , South Latitude , East West , __ for whole Earth.

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The concept of free gyroscope is .

A. if center of gravity of three-freedom gyroscope and geometric center overlap
B. gyroscope with the main axis will point to any direction
C. balanced gyroscope without any external moment exerted on
D. three-freedom gyroscope with a rigid rotating speed

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If center of gravity of three-freedom gyroscope and fulcrum overlap, it is called ______ .

______ is a rigid body rotating about the symmetrical axis of a wheel rapidly.

Gyroscope consists of gyro, inner ring, outer ring and______ .

The law of apparent motion of gyrocompass is North Latitude______ , South Latitude ______ , East______ West______ , ______ for whole Earth.

The concept of free gyroscope is .

The law of apparent motion of gyrocompass is North Latitude , South Latitude , East West , __ for whole Earth.