请将以下内容灵活、准确地翻译成英语：吸声指数测试试验方案：小组成员对两种配电房舱壁进行噪声频率0-1300Hz进行测试计算其吸声指数比对配电房舱壁的吸声指数结果如下。频率图 4-9 不同频率下配电房舱壁的吸声指数试验对比通过试验比对岩棉钢板在吸音指数方面比铝制复合板好。

Sound Absorption Coefficient Test

Test Plan: Group members tested two types of distribution room walls for noise frequencies between 0-1300Hz, calculated their sound absorption coefficients, and compared the sound absorption coefficients of the distribution room walls. The results are as follows.

Frequency Figure 4-9 Comparison of Sound Absorption Coefficient Tests of Distribution Room Walls at Different Frequencies

Through comparative testing, the rock wool steel plate is better than the aluminum composite plate in terms of "sound absorption coefficient"