阿摩線上測驗
8. A navigational aid placed to act as a beacon or warning, this is:
(A) Seamark
(B) Landmark
(C) Load line mark
(D) Plimsoll mark
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統計： A(392), B(63), C(34), D(67), E(0) #2760425
統計： A(392), B(63), C(34), D(67), E(0) #2760425
