单项选择题
Data relating to the direction and velocity of rotary tidal currents can be found in the （）.
A.Mariner's Guide B.Tidal Current Tables C.Nautical Almanac D.Tide Tables
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 （）.
单项选择题 Before a Master relieves a Pilot of the conn，the （）.
单项选择题 An embarked Pilot （）.
