单项选择题
A.transmitter B.transducer C.transceiver D.amplifier
In mid-ocean，the characteristics of a wave are determin...
单项选择题In mid-ocean，the characteristics of a wave are determined by three factors. What is NOT one of these factors?（）.
A.Effect of the moon's gravity B.Fetch C.Wind velocity D.Length of time a wind has been blowing
In a tropical cyclone，in the Northern Hemisphere，a vess...
单项选择题In a tropical cyclone，in the Northern Hemisphere，a vessel hove to with the wind shifting counterclockwise is（）.
A.ahead of the storm center B.in the dangerous semicircle C.in the navigable semicircle D.directly in the approach path of the storm
Cold water flowing southward through the western part o...
单项选择题Cold water flowing southward through the western part of the Bering Strait between Alaska and Siberia is joined by water circulating counterclockwise in the Bering Sea to form the（）.
A.Alaska Current B.Subarctic Current C.Kuroshio Current D.Oyashio Current
