Magnets in the binnacles of magnetic compa
题型:单项选择题
问题:
Magnets in the binnacles of magnetic compasses are used to reduce the effect of().
A.deviation
B.variation
C.local attraction
D.All of the above
Magnets in the binnacles of magnetic compasses are used to reduce the effect of().
A.deviation
B.variation
C.local attraction
D.All of the above