2020 National Question 2 Single-choice Differentiating 2020_新课标III Paper 2.复数 $\frac { 1 } { 1 - 3 \mathrm { i } }$ 的虚部是( ) A. $- { \frac { 3 } { 1 0 } }$B. $- { \frac { 1 } { 1 0 } }$C. $\frac { 1 } { 1 0 }$D. $\frac { 3 } { 1 0 }$ Answer keyD ☆ SaveCan't do it, show the explanation查看原卷 →