阿摩線上測驗
18. How often magnetic compass should be calibrated to determine its deviation?
(A) Annually.
(B) Biannually.
(C) Biennially.
(D) Quarterly.
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統計： A(105), B(19), C(11), D(39), E(0) #2570672
統計： A(105), B(19), C(11), D(39), E(0) #2570672
