单项选择题
On a nautical chart，the inner ring of a compass rose indicates（）.
A.true directions B.compass error C.deviation D.magnetic directions
单项选择题 Navigational warnings are published according to（）.
单项选择题 Many navigational warnings are of a temporary nature，but others remain in force for several months or may be succeeded by（）.
单项选择题 LOW AT 34N 135E ESLY SLWLY INTST NC．This description is most likely to be under the heading of（）.
