September 2019 2 31 Report
Perhatikan pernyataan di bawah ini
1.mengukur kedalaman laut
2.mempertinggi frekuensi bunyi
3.memperbesar amplitudo bunyi
4.mengetahui cacat logam
manfaat bunyi pantul ditunjukkan oleh
A.1 dan 2
B.1 dan 4
C.2 dan 3
D.2 dan 4
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