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You are about to go to sea and adjust the magnetic compass．To expedite the adjustment at sea，in what order should the following dockside adjustments be made（）.
A:Flinders bar first，then the heeling magnet and spheres
B:Heeling magnet first，then the Flinders bar and spheres
C:Flinders bar first，then the spheres and heeling magnet
D:Spheres first，then the Flinders bar and heeling magnet

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出自：海船船员证

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