The satellites over the major ocean re

1、The first communication satellite was

The first communication satellite was used for the purpose of（）.Ataking the place of the radio systemBintroducing a new life-saving systemCsaving the vessels in distressDimproving the communication on land

2、The satellite system of GAMDSS compris

The satellite system of GAMDSS comprise（）.ANAVTEX, COSPAS/SARSAT, EPIRBs and Status Recording-systemBInmarsat,COSPAS/SARSAT, EPIRBs and Status Recording-systemCNAVTEX, Inmarast,EPIRBs and SARTDInmarsat, direct Printing Telegraphy

3、The designing of a satellite in the h

The designing of a satellite in the heavenly environment is not absolutely an easy job.Aby all meansBby any meansCby every meansDby no means

4、The ocean bottom that extends from the

The ocean bottom that extends from the shoreline out to an area where there is a marked change in slope to a greater depth is the（）.Aabyssal plainBcontinental shelfCborderlandDoffshore terrace

5、The cold ocean current which meets the

The cold ocean current which meets the warm Gulf Stream between latitudes 40°and 43°N to form the cold wall is called the（）.ANorth Cape CurrentBLabrador CurrentCGreenland CurrentDNorth Atlantic Current

6、The major difference between the disch

The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）Aone valve...