单项选择题
A.Satellite network
B.Satellite link
C.GMDSS
D.Satellite system
单项选择题 For ships equipped with an SES, it is（）and（）for the operator to send a distress alert.
单项选择题 In the COSPAS-SARSAT system distress signals are processed by（）and the resulting data are forwarded to（）through（）communication network.
单项选择题 The COSPAS-SARSAT system can provide distress alerts to the appropriate rescue authorities（）.