单项选择题
If no distress acknowledgement is received（）a DSC distress call transmission, then the ship in distress may repeat the DSC distress call attempt after a delay of between 3.5 and 4.5 minutes from the beginning of the initial call.
A.relevant to B.relate to C.in response to D.in relation to
单项选择题 What’s the abbreviation for the World Meteorological Organization?（）
单项选择题 Geostationary satellites are the artificial satellites which（）.
单项选择题 What following is not among the functions of SOLAS ships?（）
