Mọi sự tiêu hao của con người đều là lao động trừu tượng đúng hay sai?

In exchange for land, a knight agrees to be a sort of sub-vassal to a vassal. this agreement was known as: investiture homage tyranny subinfeudation

The government of country a has determined there is a coal shortage based on mining reports.as a result of these data, the government decreases coal exports to other nations. access to information country a

What caused the settlement of more african americans in the mississippi alluvial plain region than in the ozark mountains point)