43.地球的磁場強度約為多少?
(A)0.6 G
(B)5 G
(C)0.6 T
(D)5 T
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統計: A(1229), B(296), C(192), D(110), E(0) #2867201
統計: A(1229), B(296), C(192), D(110), E(0) #2867201