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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
Most modern vending machines are controlled by small computers. The computer scans the bill, coin, or card that you insert, then uses your input from the keypad to select the correct drink or snack. A mechanical device may grab the product and move it to the vending slot, or a spiral arm might retract to release and drop the snack.
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