問題詳情

20. 「Obstruction or danger to navigation the exact nature of which is not specified or has notbeen determined, depth unknown」- it will be marked in the chart by:
(A)  
(B)  
(C)  
(D)

參考答案

答案:A
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)

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