单项选择题
A.IALA Buoyage system
B.hydrography，topography，navigational aids and their services
C.basic meteorology and navigation in ice and hazards and restrictions to navigation
D.information on tides，currents and characteristics of the sea
单项选择题 The daily predictions of the times and heights of high and low water for a selection of Standard Ports are given in（）.
单项选择题 The Coast Radio Stations are found in（）.
单项选择题 On an Atlantic Ocean voyage from New York to Durban，South Africa，you should expect the Agulhas Current to present a strong（）.