February 2019 1 19 Report
Ayah mengadakan seminar dalam aula luas agr tidk trjadi gaung sehingga suarabpembicaraan dapat terdengar dengan jelas maka dinding aula dilapisi bahan bahan penyerap bunyi yaitu
a kayu jati.. kaca. asbes
b kaca... porselin dan marmer
ckarpet... gabus.. kainwol
dbatu alam.. semen batako
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