单项选择题
On a weather map,a large letter “h” means（）
A.a high pressure area with cool, dry air and fair weather B.a high pressure area with warm, moist air and inclement weather C.horse latitudes, with rough seas and strong winds D.a heavy squall line near the “H”
单项选择题 There are often three parts in a weather report, not including（）
单项选择题 Which of the following is defined as static information of AIS?（）
单项选择题 When hitting a solid object such as ship or an airplane,the radar waves are reflected back（）they came.
