细菌由局部侵入血流，在血中繁殖，产生大量毒性物质，而引起人体中毒，称为（）

A.毒血症

B.脓毒血症

C.病毒血症

D.败血症

E.菌血症

Which device provides the main means in the GMDSS for locating ships in distress or their survival craft（）.

A.Radio direction finder

B.Satellite EPIRBs

C.MF/HF DSC

D.VHF homing device