A.32.75 B.29.75 C.26.5 D.23.5
A.PQ節(jié)點(diǎn) B.PV節(jié)點(diǎn) C.平衡節(jié)點(diǎn) D.參考節(jié)點(diǎn)
A.500B.250C.0.02D.0.002