单项选择题
For full information regarding the current circulation of the Indian Ocean，（） Sailing Direction，Current Atlas，etc．
A.watch B.look for C.see D.regard
单项选择题 ETA／PILOT REVERTING means （） ．
单项选择题 Data relating to the direction and velocity of rotary tidal currents can be found in the （）.
单项选择题 Coral atolls，or a chain of islands at right angles to the radar beam，may show as a long line rather than as individual targets due to （）.
