A、Distress/distress B、allship/Distress C、Distress/ALL ship D、All ship/All ship
A、呼叫序列 B、應答序列 C、應答方 D、B和C
A、垂直校驗群計數(shù)碼 B、整偶數(shù)檢驗碼 C、群計數(shù)碼 D、偶校驗碼