The formula for calculating the solid flow rate in gas-solid flow oy using venturi meter is presented, which is also linear under certain conditions.

最后得出气—固两相流中，用文丘利流量计测量固相流率时的计算公式。它在一定条件下也是线性的。

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By regarding a linear light source as a directional rectangular light source with infinitesimal width, a simple formula is derived for calculating the diffuse reflection component.

通过将线光源看作一个具有无限细小宽度的有向长方形光源，我们得到了一个计算漫反射分量的简洁公式。

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The design process of such synthetic array is given and a simple and correct formula of calculating the interval between sensors of the synthetic linear and uniformly-sampled array is put forward.

文中通过对基于扇区内插法设计虚拟均匀线列阵的研究，给出了设计的具体步骤，并提出一个简单且准确的虚拟线列阵阵元间隔的计算公式。

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