$$\mathit{一种}=\left[\begin{array}{ccc}{\mathit{一种}}_1& {\mathit{一种}}_2& {\mathit{一种}}_{3.}\end{array}\right]那\mathit{B.}=\left[\begin{array}{c}{\mathit{B.}}_1\\ {\mathit{B.}}_2\\ {\mathit{B.}}_{3.}\\ {\mathit{B.}}_{4.}\end{array}\right]那\mathit{一种}。*\mathit{B.}=\left[\begin{array}{ccc}{\mathit{一种}}_1{\mathit{B.}}_1& {\mathit{一种}}_2{\mathit{B.}}_1& {\mathit{一种}}_{3.}{\mathit{B.}}_1\\ {\mathit{一种}}_1{\mathit{B.}}_2& {\mathit{一种}}_2{\mathit{B.}}_2& {\mathit{一种}}_{3.}{\mathit{B.}}_2\\ {\mathit{一种}}_1{\mathit{B.}}_{3.}& {\mathit{一种}}_2{\mathit{B.}}_{3.}& {\mathit{一种}}_{3.}{\mathit{B.}}_{3.}\\ {\mathit{一种}}_1{\mathit{B.}}_{4.}& {\mathit{一种}}_2{\mathit{B.}}_{4.}& {\mathit{一种}}_{3.}{\mathit{B.}}_{4.}\end{array}\right]。$$