What is a factory? what is a factory

Cost and benefit in economic example

24-karat gold is considered to be pure gold. 18-karat gold is considered to be about 75% gold. what is 18-karat gold considered a mixture rather than a pure substance? a) it has a variable composition of other elements and minerals. b) its color is different than pure gold. c) the gold atoms are not arranged in a repeating pattern. d) it can be melted and transformed into a different substance.

When the communist, under mao, took control of china in 1949 they announced total support support for which country and its ideology?