2. Beijing time (Daylight Saving Time): Monday to Friday 8:00-20:45, Monday to Saturday 21:30-02:20 last trading day the penultimate trading day before the 15th day of the delivery month, the contract expires at noon on the last trading day.
I. Definitions
1. The United States of America (English: The United States of America, United States, referred to as "the United States"), is a federal **** and constitutional system of government consisting of Washington, D.C., the 50 states and Guam, and many other overseas territories. The United States is a federal*** and constitutional state. Its main part is located in the central part of North America, the United States Central Intelligence Agency, "The World Factbook," the initial version of the United States from 1989 to 1996, a total area of 9,373,000 square kilometers, with a population of 333 million people, the general English language, a country of immigration.
2. The United States was originally an Indian settlement, the end of the 15th century, Spain, Holland, France, Britain and other successive immigrants to this. 18 centuries ago, Britain in the United States on the Atlantic coast of the United States established 13 British colonies in North America. 1775, the outbreak of the War of Independence of the people of the United States against colonial rule by the British empire. 1776, July 4, the Second Continental Congress held in Philadelphia On 1776.7.4, the Second Continental Congress was held in Philadelphia, with George Washington as the Commander-in-Chief of the Continental Army. At the end of the War of Independence in 1783, Britain recognized the independence of the 13 colonies. 1787, the U.S. Constitution was adopted, establishing a federal state
3. 1861-1865, the U.S. Civil War broke out. Abraham Lincoln led the free states of the North to victory over the slaveholding states of the South. From then on, the United States ended the "half-slave, half-freedom", began to fully implement free capitalism, embarked on the road of rapid development. 1803-1959, through the means of purchase and war, the territory continued to expand
Topography
2, topography
1. The east coast coastal area has a coastal plain, south wide and north narrow, has been extended to New Jersey, in Long Island and other places there are some glacial sedimentary plain. Behind the Coastal Plain are the rolling foothills that extend to the 1,830-meter-high Appalachian Mountains in North Carolina and New Hampshire.
2. West of the Appalachian Mountains is the U.S. Central Great Plains, a relatively flat landscape where the Great Lakes and the Mississippi River-Missouri River Basin - the world's fourth-largest river basin - are also located. West of the Mississippi River, the topography of the interior plains begins to rise and eventually enters the vast and sparsely characterized Great Plains of the central United States.