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What happens to rock when acid reacts with it?

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4

Which of the following events did not occur as a result of china’s open-door policy? a. trade between japan and china was encouraged. b. all countries were given equal access to chinese ports. c. foreign influence in china increased. d. the influence of the communist party weakened.