单项选择题
The satellites over the major ocean regions cover the globe（）.
A.besides the polar regions B.including the North Pole and the South Pole C.above 70N and below 70S D.as far north and south 70
单项选择题 The Inmarsat system has five major components, they are:（）.
单项选择题 The INMARSAT consists of（）major components.
单项选择题 why should the SES operators be very careful when the ship enters the area where three ocean regions overlap? Because（）.
