3.摩斯碼，字母“R”的電碼是： (A)－－˙ (B)－˙－ (C)˙－˙ (D)˙－－

11.When two power-driven vessels are meeting on reciprocal or near reciprocal courses, so as to involve risk of collision, which action is the best and correct? (A)The big ship shall stop her engine. (B)The small ship shall stop her engine. (C)Each shall alter her course to starboard. (D)Each shall alter her course to port.