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To center a compass bowl in its binnacle，you should have the ship on an even keel，heading north or south，and adjust the screws until（）.
A:the compass heading is in line with the lubber's line
B:there is no lost motion in the gimbal rings
C:no change of heading by compass is observed if you raise and lower the heeling magnet
D:the gimbal rings do not strike the compass frame when they are tilted

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出自：海船船员证

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