单项选择题
In Inmarsat-A, “Priority 3” means（）communication.
A.routine B.distress C.urgency D.safety
单项选择题 Who has permit the SES enter the system after successful commissioning?（）
单项选择题 After successful commissioning, the（）will permit the SES access to system.
单项选择题 During a（）period, as a newly commissioned SES, your IMN will be past to the other CESs.
