Olympic Games traditional competition program rowing, what are its competition rules?

Shunyi Olympic Water Park is the 2008 Beijing Olympic Games rowing, kayaking, marathon swimming and Paralympic rowing events competition venues, the competition attracted a lot of domestic and foreign tourists to come to watch the race, I'm going to talk about one of them today, rowing, but also the Olympic Games is one of the most traditional competitions, first of all talk about rowing, rowing is by one or more oarsmen sitting on the Boat, back to the direction of the boat, the use of its muscle power, through the oars and oar frame simple leverage for rowing, so that the boat forward a water sport. The boat can have a coxswain or no coxswain. Rowing originated in England in the 17th century, when boatmen on the Thames River used to hold rowing competitions, and the first regatta was held in 1715 to celebrate the coronation of the King of England, and the rules for regattas were formulated in England in 1775, and a rowing club was established in the same year. The first World Rowing Championships were held in Switzerland in 1962, and four were held in 1974***. From 1975 onwards, a World Championship was held every year. There are many rowing programs. At present, the International Rowing Federation set up the World Rowing Championships have 23 programs, divided into four levels. They are: men's open class, lightweight; women's open class, lightweight. Each level is divided into single and double sculls according to the form of the movement; according to the number of participants in single, double, quadruple, eight rowing; some items are also divided into coxed, coxless. In order to simplify, the name of the project with a combination of letters, numbers and symbols to indicate: "M" for men, "W" for women, "L" for lightweight, the number of figures for the number of oarsmen, "?" for double oars, "+" for single oars with coxswain, "-" for single oars without coxswain. Therefore, rowing according to the number of oarsmen, weight, rowing mode and coxswain or not, can be divided into eight kinds of rowing events. The International Rowing Federation also organizes competitions such as the World Rowing Championships for under-23s, the World Para Rowing Championships, the World Cup Series and the World Veterans Rowing Championships.