单项选择题
A.Φ20.021和Φ20B.Φ20和Φ20.021C.Φ19.979和Φ20D.Φ20和Φ19.979
A.Φ20.013和Φ19.987B.Φ20和Φ19.987C.Φ20和Φ20.013D.Φ20.013和Φ20
A.EB.MC.RD.L