单项选择题
A.The topics for warnings included in HYDROLANTS，HYDROPACS，and NAVAREA warnings are the same
B.NAVAREA warnings concern only coastal navigation and inland navigation in large bays or sounds such as Puget Sound
C.The United States is responsible for NAVAREA warnings in the North Atlantic north of 7°N，and west of 15°W
D.Long range radio navigational warnings are usually broadcast by radiotelephone，radiotelegraph，and radio-teletypewriter
单项选择题 Which instrument is most useful in forecasting fog（）.
单项选择题 Which channel and mode should be used when initiating a distress alert transmission（）.
单项选择题 Where the master has not disclosed to the suppliers of necessaries that under an existing time-charter the Charterer is liable for the particular disbursements in question，（）will be liable to such suppliers to that extent.