18. What is the size of black ball stipulated in COLREGS?
(A) The diameter of the black ball shall not be less than 0.5 meter.
(B) The diameter of black ball shall not be less than 0.6 meter.
(C) The diameter of black ball shall not be less than 0.8 meter.
(D) The diameter of black ball shall not be less than 1.0 meter.
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這是一題關於《國際海上避碰規則》（COL...
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