A crane is a machine that is capable of raising and lowering heavy objects and moving them horizontally. Cranes continued to rely on human or animal power until the middle of the nineteenth century, when steam engines were developed. By the end of the nineteenth century, internal combustion engines and electric motors were used to power cranes. By this time, steel rather than wood was used to build most cranes. Depending on the exact design of the crane, a wide vari.

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Documentación de Practicas 3 parcial. José Humberto Pereyra Quintana No. Carlos Ivana Ramírez Romero No. Tabla alumnos y bases de datos C . Crearemos una base de datos alumnos en el cual controlaremos cual es su carrera puntos, promedio, etc.