单项选择题
Areas enclosed by a long and short dashed magenta line indicate （）.
A.cable areas B.dumping grounds C.fish trap areas D.precautionary areas
单项选择题 An occulting light is one in which （）.
单项选择题 AFTER DROPPING THE PILOT means （）.
单项选择题 Above-normal tides near the center of a hurricane maybe caused by the （）.
