單項(xiàng)選擇題

This induced magnetism（）the permanent magnetism already present in the ship.

A.will add to
B.will subtract from
C.may add to or subtract from
D.will not change

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單項(xiàng)選擇題

The variation for most given areas undergoes（）change，the amount of which is also noted on charts.

A.an annual
B.a constant
C.a variable
D.an unstable

單項(xiàng)選擇題

The quadrantal spheres are used to（）.

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

This induced magnetism（）the permanent magnetism already present in the ship.

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The variation for most given areas undergoes（）change，the amount of which is also noted on charts.

The quadrantal spheres are used to（）.

The variation for most given areas undergoes（）change，the amount of which is also noted on charts.