1. Kí hiệu các tập bằng các chữ cái lớn: A, B, …, N, X, Y, … Kí hiệu các phần tử của tập là các chữ cái nhỏ: a, b, x, y, … Hệ thức nào sau đây là đúng?

Which one of the following is true of jamestown? sir francis drake founded the settlement in 1619. o john smith was responsible for introducing tobacco. o black slaves were brought to jamestown in 1619.

What was a result of the industrial revolution in the united states

Following archduke franz ferdinand's assassination, austro-hungarian leaders: a. aided the ottoman empire in its campaign to keep serbia under its control. b. executed nearly all prominent serbs living in austria-hungary c. threatened to invade serbia if serb leaders did not agree to a set of strict demands. d.. formed an alliance with great britain to protect austria-hungary from future attacks.