The pentahedral bicharacteristic curve grid can be applied to investigate the thrust misalignment characteristics in a unsteady flow.

证明五面体双徵曲线网格方法可用来研究非定条件下的推力偏心性。

A method is also presented for calculating the side area and volume of critical rocks with arbitrary pentahedron as example.

以任意五面体为,了危石侧面积、积的计算方法。

Instead of the solid block of glass of the prism in pentaprism system, here 3 simple mirrors are used to perform the same task.

五面镜不是用一整个玻璃棱镜，而是用3块镜子来达到相同的目的。