单项选择题
In addition to communication equipment, the GMDSS will introduce requirements of SARTs and EPIRBs designed to improve the（）.
A.living standards B.survival condition C.chance of survival D.technical specification
单项选择题 The GMDSS must combine all various subsystems, because（）.
单项选择题 Which Inmarsat system applies store-and-forward messaging?（）
单项选择题 The basic concept of GMDSS is（）.
