下列不属于SDH设备三大基本功能的是：()

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A：Permanent screens, used in the half-screen part of the urban model, are used to define the environment along the calculation profile in a general way and, therefore, the locations of the screens do no
B：Temporary screens, used in the half-screen part of the urban model, are used to describe details of the environment more accurately, near the mobile antenna and, therefore, the locations of the screen
C：The recursive microcell part of the urban model uses something called the illusory distance, which is always longer than or equal to the line-of-sight distanc
D：The resulting path loss from the urban model is obtained by taking the maximum value of the two contributions, calculated by the half-screen and recursive microcell algorithms.
E：Inside a building, the path loss is calculated using a simple building penetration algorithm.

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