October 2018 2 89 Report
1.Alat komunikasi isyarat pada saat ini,kecuali.....
a.bedug
b.alarm
c.sirine
d.lampu rambu lalu lintas

2.Keunggulan alat komunikasi masa lalu adalah.....
a.wilayahnya luas
b.biaya alat murah
c.perawatan mahal
d.modern dan canggih
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