.RLC串联交流电路中，R=6Ω、XL=15Ω、XC=7Ω、电压u=220[2^(1/2)]sin(314t+30?)V，求电抗、阻抗、阻抗角、电流、电流瞬时值表达式、三种电功率，并判断电路性质。([2^(1/2)]代表2的1/2次方)
A.8Ω；10Ω；53.13°；22A；i=22×[2^(1/2)]sin(314t-23.13?)(A)；2.904kW；3872Var；4840V·A；感性
B.10Ω；10Ω；53.13°；22A；i=22×[2^(1/2)]sin(314t-23.13?)(A)；2.904kW；3872Var；4840V·A；感性
C.12Ω；10Ω；53.13°；22A；i=22×[2^(1/2)]sin(314t-23.13?)(A)；2.904kW；3872Var；4840V·A；感性
D.8Ω；20Ω；53.13°；22A；i=22×[2^(1/2)]sin(314t-23.13?)(A)；2.904kW；3872Var；4840V·A；感性
正确答案是A