In 1962 the museum was expanded as a regular prism designed internally with mezzanines that occupied the space that Kronfuss had imagined as the central courtyard of the museum.

1962年，美术馆经过扩建，成为常规的棱柱形式，内部设计有夹层，占据了Kronfuss原本设想为中央庭院的空间。

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The shape of block stones shall be close to straight prism or regular quad or polygons.

块石形状应接近直棱柱体，或有规则的四边形或多边形。

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Then by taking the regular square prism as an example, the machining error is analyzed, and the relationship among the length of the lathe tool, the work dimension and the tolerance is obtained.

以车削正四棱柱为例，进行了误差分析，得到了刀具长度与工件尺寸和容许误差间的关系。

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