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单选题
The terrestrial system of GMDSS consists of（）.
A
radio-telephony, DSC, Direct Printing Telegraphy,Navtex and SART
B
INMARSAT, DSC, Direct Printing Telegraphy, Navtex and SART
C
radio-telephony,DSC,EPLRB,Navtex and SART
D
Status Recording system,DSC,Direct Printing Telegraphy, Navtex and SART
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