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 （）.
A.the effects of beam width B.limitations on range resolution C.the pulse length of the radar D.the multiple-target resolution factor
单项选择题 Before a Master relieves a Pilot of the conn，the （）.
单项选择题 An embarked Pilot （）.
单项选择题 An anchored vessel on pilotage duty must show which light(s) at night? （）
