问题
单项选择题
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called().
A.flux
B.poles
C.magnets
D.azimuth
答案
参考答案:B
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called().
A.flux
B.poles
C.magnets
D.azimuth
参考答案:B