阿摩線上測驗
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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統計： A(11), B(68), C(28), D(23), E(0) #1900608
統計： A(11), B(68), C(28), D(23), E(0) #1900608
