单项选择题
The vertical angle between the horizontal and the magnetic line of force is the（）.
A.elevation
B.magnetic angle
C.vertical angle
D.dip
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相关考题
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单项选择题
The total magnetic effects which cause deviation of a vessel’s compass can be broken down into a series of components which are referred to as（）.
A.divisional parts
B.coefficients
C.fractional parts
D.equations -
单项选择题
The standard magnetic compass heading differs from the true heading by（）.
A.compass error
B.latitude
C.variation
D.deviation -
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The reaction of a gyrocompass to an applied force is known as（）.
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B.earth rate
C.gyroscopic inertia
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