問題詳情

261When testing the car speed with a stationary or non- stationary scientific equipment and a vehicle is caught as traveling at a speed high than the maximum or lower than the minimum speed, how far ahead should the sign for such testing be placed?
(A)Between 100 meters and 300 meters
(B)Between 200 meters and 400 meters
(C)Between 300 meters and500 meters.

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