问题
单项选择题
()are used for distress alerting as a rule.
A.SES/DSC/EPIRB
B.SART/radiotelephone
C.COSPAS-SARSAT
D.both B and C
答案
参考答案:A
()are used for distress alerting as a rule.
A.SES/DSC/EPIRB
B.SART/radiotelephone
C.COSPAS-SARSAT
D.both B and C
参考答案:A