单项选择题
A.Let the anchor fall free from the hawsepipe，but apply the brake at intervals to check the rate of fall
B.Back the anchor slowly out of the hawsepipe a few feet，and then let it fall in the normal fashion
C.Let the anchor fall off the brake right from the hawsepipe，but keep a slight strain on the brake
D.Under power，back the anchor out until it is near，but clear，of the bottom before letting it fall
单项选择题 Which is a weekly publication advising mariners of important matters affecting navigational safety（）.
单项选择题 What is the significance of the broken magenta lines which roughly parallel the shore between Roanoke Point and Orient Point on Long Island（）.
单项选择题 What is the most important source of information to be used in correcting charts and keeping them up to date（）.