阿摩線上測驗
8. Oil was used instead of water in magnetic compass to stabilize the compass disk from erratic movement.
(A) noticeable
(B) mercurial
(C) constant
(D) unoriginal
(E) threadbare
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統計： A(4), B(41), C(9), D(15), E(1) #2055870
統計： A(4), B(41), C(9), D(15), E(1) #2055870
