平面刚架单元的座标转换矩阵为T,平面桁架单元的座标转换矩阵为t,以下说法正确的是
A.T和t都是2×4阶矩阵
B.T和t都是6×6阶矩阵
C.T是2×3阶矩阵,t为6×6阶矩阵
D.T为6×6阶矩阵,t为2×4阶矩阵
正确答案是D
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