21.When two power-driven vessel are meeting __________ so as to involve risk of collision, each shall alter her course to starboard so that each shall pass on the port side of the other.
(A) on reciprocal
(B)in reciprocal
(C)on reciprocally
(D)in reciprocally

船舶通訊與航海英文(概要)- 99 年 - 099年第四次航海人員船舶通訊與航海英文概要#47161

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