单项选择题
Which would influence a magnetic compass（）.
A.Electrical wiring
B.Iron pipe
C.Radio
D.All of the above
相关考题
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单项选择题
Which is the correct procedure for anchoring a small to medium size vessel in deep water （）.
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（）.
A.Light List
B.Notice to Mariners
C.Coast Pilot
D.Sailing Directions -
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（）.
A.They mark the limits of breakers in that area
B.These lines warn the mariner of submerged rocks
C.They mark the boundary lines of fish trap areas
D.These lines warn the mariner of submerged pipelines
