阿摩線上測驗
21. An area which cannot be scanned by the ship’s radar because it is shielded by parts of its
superstructure, mast, etc. We call it is:
(A) Blind secretary
(B) Blind sector
(C) Shading area
(D) Shackle area
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統計： A(67), B(481), C(68), D(51), E(0) #1854512
統計： A(67), B(481), C(68), D(51), E(0) #1854512
