saxonyramirez20 saxonyramirez20

26-10-2017
History

contestada

Which two innovations helped the railroads grow?
A. Automatic lubricator and camera
B. Telegraph and telephone
C. Air brakes and steam power
D. Light bulb and hotel cars

Respuesta :

capricetillman capricetillman

26-10-2017

light bulb and hotel cars

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onedirectionfamily onedirectionfamily

26-10-2017

The answer is C. Air brakes and steam power.

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