322.对于华为U2000侧，掉话率公式定义哪一项是正确的?

322.对于华为U2000侧，掉话率公式定义哪一项是正确的?

A.Call Drop Rate=L.E-RAB.AbnormRel/L.E-RAB.NormRel*100%

B.Call Drop Rate=L.E-RAAbnormRel/(L.E-RANormRel+L.E-RAAbnormRel)*100%

C.Call Drop Rate=L.E-RAB.AbnormRel/L.E-RAB.SuccEst*100%

D.Call Drop Rate=L.E-RAB.AbnormRelRRC Connection Setup Success*100%

正确答案是B