单项选择题
What’s the abbreviation for the World Meteorological Organization?（）
A.WMO B.IHO C.IMO D.WARC
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?（）
单项选择题 The existing terrestrial radio system has a number of basic flaws which（）.
