单项选择题
The fog most commonly encountered at sea is called（）.
A.conduction fog B.radiation fog C.frontal fog D.advection fog
单项选择题 The Daily Memorandum contains information on（）.
单项选择题 The charts show two dashed lines crossing the river justsouth of St. Catherine Bar Light. What does this indicate? （）
单项选择题 The broken magenta line which runs parallel to the shorebetween Roanoke Point and Mattituck Inlet marks a（）.
