Lots of ! how many years did it take the modern engineers to figure out how the roman concrete was made out of? pls give me the accurate number, its for a !

Which is not a characteristic of a multiparty system?

2. what was the significance of the british reform act of 1832? members of the middle class were permitted to run for parliament. members of the working class demanded and received better living conditions. voters were given the right to vote by secret ballot, farm workers, factory workers, and women were given the right to vote.

Which of the following was probably the most difficult challenge facing construction of the railroad?