单项选择题
（）process the distress signal from EPIRB to determine its position and identity.
A.COSPAS-SARSAT B.Ground receiving stations C.storing distress signal D.Near-polar orbiting satellites
单项选择题 It is（）for mariners to combine the SART with a float-free satellite EPIRB.
单项选择题 （）is a space system using one or more artificial earth satellites.
单项选择题 For ships equipped with an SES, it is（）and（）for the operator to send a distress alert.
