"la microeconomía estudia la demanda de mercado mientras que la macroeconomía estudia la demanda agregada, como el consumo total de un país" esto se podría decir que es cierto o falso ??

Modern high speed trains do not have perpendicular expansion gaps where rails are joined end-to-end any more they are mostly welded together but what might happen if there was a spell of particularly hot weather that causes inspection of the tracks?

What is creep? what is stress relaxation?

What is the major difference between thermoplastics and thermosetting plastics from the polymerization structure point of view?