单项选择题
A.Distress and alarm signals transmitted or intercepted
B.Times of beginning and end of watch period
C.Routine navigational traffic
D.Daily statement about the condition of the required radiotelephone equipment
单项选择题 Upon receipt of a distress message，a merchant vessel is bound to proceed to the scene of the distress. Under which of the following cases would this NOT be true?（）
单项选择题 Three short blasts of the whistle means（）.
单项选择题 The signal to guide vessels in distress，which indicates，“This is the best place to land” is the（）.