单项选择题
The Sailing Directions contain information on （）.
A.required navigation lights B.lifesaving equipment standards C.casualty reporting procedures D.currents in various locations
单项选择题 You will find information about the duration of slack water in the （）.
单项选择题 （）amplify charted detail and contain information needed for safe navigation.
单项选择题 Admiralty Sailing Directions are Kept up to date by （）.
