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
更多“The principal purpose of magnetic compass adjustment is to（）.”相关的问题
A、The principal protective coating is paint. B、The principal protective coating is cement wash. C、The principal protective coating is bitumen. D、The principal protective coating is varnish.
A、Greenwich celestial meridian B、hour circle of the body C、local celestial meridian D、vertical circle of the body
A、metacenter B、geometric center of the waterplane area C、center of gravity D、center of flotation
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