对青霉素最易产生耐药的是( )。

A．肺炎球菌
B．脑膜炎球菌
C．金黄色葡萄球菌
D．溶血性链球菌
E．白喉杆菌

By using（）system a ship can send a distress message and know with certainty it will be received.

A.COSPAS-SARSAT

B.SATELLITE

C.terrestrial radio

D.INMARSAT