单选题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（）.Athe compass heading is in line with the lubber's lineBthere is no lost motion in the gimbal ringsCno change of heading by compass is observed if you raise and lower the heeling magnetDthe gimbal rings do not strike the compass frame when they are tilted
单选题
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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