Error may be introduced into a magnetic compass by ______.
A.making a structural change to the vessel
B.a short circuit near the compass
C.belt buckles
D.All of the above
正确答案：D
船舶结构上的改变罗经附近的短路带扣都可能引起磁罗经的误差
Errormaybeintroducedintoamagneticcompassby______A
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