aron1611 aron1611

16-07-2018
Advanced Placement (AP)

contestada

Controls at railroad crossings include:
a. Crossing gates
b. Flashing green lightsC. Crossing guardsD. Sirens

Respuesta :

garrettdelong garrettdelong

16-07-2018

To me, the Answer to this problem is A. Crossing Gates.

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