单相全波整流式X线机的热量计算公式为

A．HU=0.707xkVpxmAxs

B．HU=1.30xkVpxmAxs

C．HU=1.414xkVpxmAxs

D．HU=1.732xkVpxmAxs

E．HU=kVpxmAxs