心率在正常范围内，成年人的P－R间期为（)A、0.12s~0.20sB、0.14s~0.20sC、0.16s~0.20sD、0.18s~0.20s

心率在正常范围内，成年人的P-R间期为()

A、0.12s~0.20s

B、0.14s~0.20s

C、0.16s~0.20s

D、0.18s~0.20s