它的主要优点是：可以用微分筒一端和表头一端分别是进行工件尺寸的测量。
Their main advantage is that the measurement of the dimensions of workpieces can be made either by means of the dial indicator or by means of the micrometer head.
根据变截面框筒结构的截面沿高度为阶形变化的特点，以每个相同截面的层作为一个计算单元，每个单元由微分方程组导出其单元矩阵、截面矩阵和传递矩阵。
Every storey with a same section is taken as a calculation element. The element matrix, section matrix and transfer matrix of every element are derived by the differential equations.
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