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សង្រ្គាម ជំលោះតាម បណ្តាទ្វីប

ប្រធានបទ វិស្វកម្ម យោធា

Sunday, September 28, 2014

Speed Detection Radar

It performs job by measuring an " angle" of the targeted object. Police employs reflecting sound to calculate the speed of an object.


















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