阿摩線上測驗
40. ______ are the correctors for the magnetic compass that can be
used to remedy the the deviation caused by the induced B coefficient.
(A) Vertical permanent heeling magnets
(B) Athwartship C permanent magnets
(C) Soft-iron quadrantal spheres
(D) Vertical soft-iron Flinders bar
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統計： A(72), B(27), C(76), D(253), E(0) #1312629
統計： A(72), B(27), C(76), D(253), E(0) #1312629
