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)