患者，男性，20岁。大腿深部脓肿，切开排脓后引流不畅，病程持续l个月，近期突然出现寒战，继以弛张型高热，数日后背部及腹壁出现波动性肿块，轻压痛。最可能的诊断是

A．毒血症

B．败血症

C．背部及腹壁脓肿

D．菌血症

E．脓血症

The first communication satellite was used for the purpose of（）.

A.taking the place of the radio system

B.introducing a new life-saving system

C.saving the vessels in distress

D.improving the communication on land