在数字系统最佳接收机中，下列哪种调制方式具有最低的误码率：（）
A.相干2PSK
B.相干2FSK
C.非相干2FSK
D.相干2ASK
参考答案：A
22．Somalia pirates, mainly made up of four groups,_______________,Puntland Group, National. Volunteer Coast Guad, Merkah and Somalia Marine, are currently active in the Somali waters.
A．including
B．regarding
C．namely
D．Besides
试述原发性纤溶亢进与DIC继发性纤溶的鉴别要点。
