【正文】 答： 預(yù)應(yīng)力混凝土結(jié)構(gòu)構(gòu)件所用的混凝土，需滿足下列要求： （ 1）強(qiáng)度高。以減少因收縮、徐變引起的預(yù)應(yīng)力損失。（ 1）減少錨固回縮損失的措施：選擇錨具變形小或使預(yù)應(yīng)力鋼筋內(nèi)縮小的錨具和夾具，并盡量少用墊板；增加臺座長度。（ 5）減少收縮和徐變應(yīng)力損失，應(yīng)采取減少混凝土收縮和徐變的各種措施，同時(shí)應(yīng)控制混凝土的預(yù)壓應(yīng)力。該狀況主要作承載力極限狀態(tài)設(shè)計(jì)，必要時(shí)才做正常使用極限狀態(tài)設(shè)計(jì)。 m。將各已知值帶入00()2d cd xM f bx h? ??，得 61 . 0 1 6 0 1 0 1 1 . 5 2 0 0 5 1 0 2xx ??? ? ? ? ????? 解得 1208 5 8 m m( )1 6 2 m m 0 . 5 6 5 1 0 m m 2 8 5 . 6 m mbxxh ???? ? ? ? ? ??大 于 梁 高 ， 舍 去 （ 3）求所需鋼筋面積 sA 將各已知值及 162mmx? 代入 cd sd sf bx f A? ，得到 21 1 . 5 2 0 0 1 6 2 1 3 3 0 . 7 m m280cdssdf b xA f ??? ? ? 可選用 2 25 + 1 22（ ? ）， 將鋼筋 布置成一層， 1 22 鋼筋布置在中央， 2 25 鋼筋布置在兩邊。 請您刪除一下內(nèi)容， O(∩ _∩ )O 謝謝?。?！ 2021年中央電大期末復(fù)習(xí)考試小抄大全，電大期末考試必備小抄，電大考試必過小抄 Basketball can make a true claim to being the only major sport that is an American invention. From high school to the professional level, basketball attracts a large following for live games as well as television coverage of events like the National Collegiate Athletic Association (NCAA) annual tournament and the National Basketball Association (NBA) and Women39。s bounce. Inside the covering or casing, a rubber bladder holds air. The ball must be inflated to a pressure sufficient to make it rebound to a height (measured to the top of the ball) of 4954 in ( m) when it is dropped on a solid wooden floor from a starting height of 6 ft ( m) measured from the bottom of the ball. The factory must test the balls, and the air pressure that makes the ball legal in keeping with the bounce test is stamped on the ball. During the intensity of high school and college tourneys and the professional playoffs, this inflated sphere mands considerable attention. Basketball is one of few sports with a known date of birth. On December 1, 1891, in Springfield, Massachusetts, James Naismith hung two halfbushel peach baskets at the opposite ends of a gymnasium and outlined 13 rules based on five principles to his students at the International Training School of the Young Men39。 smaller gyms used five players on a side, and the larger gyms allowed seven to nine. The team size became generally established as five in 1895, and, in 1897, this was made formal in the rules. The YMCA lost interest in supporting the game because 1020 basketball players monopolized a gymnasium previously used by many more in a variety of activities. YMCA membership dropped, and basketball enthusiasts played in local halls. This led to the building of basketball gymnasiums at schools and colleges and also to the formation of professional leagues. Although basketball was born in the United States, five of Naismith39。 and Japan in 1900. From 1891 through 1893, a soccer ball was used to play basketball. The first basketball was manufactured in 1894. It was 32 in (81 cm) in circumference, or about 4 in (10 cm) larger than a soccer ball. The dedicated basketball was made of laced leather and weighed less than 20 oz (567 g). The first molded ball that eliminated the need for laces was introduced in 1948。s game. Television interest followed the women as well with broadcast of NCAA championship tourneys beginning in the early 1980s and the formation of the WNBA in 1997. Internationally, Italy has probably bee the leading basketball nation outside of the United States, with national, corporate, and professional teams. The Olympics boosts basketball internationally and has also spurred the women39。s professional leagues were attempted and failed, including the Women39。 the Cleveland Rosenblums, owned by Max Rosenblum。s Harlem Globetrotters, which was actually from Chicago. While these teams had some notable players, no superstars, such as Babe Ruth, Jack Dempsey, or Red Grange, emerged to capture the public39。M was almost seven feet tall and Gee Mikan at DePaul was six feet ten inches. While Kurland had perhaps the better college career and played in two Olympics, he chose not to play professional ball, whereas Mikan became the first dominant st。s development: zone defenses, the weave, the passing game, and the fast break. In the decade preceding World War II, five events changed college basketball and allowed it to bee a major spectator sport. In 1929, the rules mittee reversed a decision that would have outlawed dribbling and slowed the game considerably. Five years later, promoter Edward Ned Irish staged the first intersectional twin bill in Madison Square Garden in New York City and attracted more than 16,000 fans. He demonstrated the appeal of major college ball and made New York its center. In December 1936, Hank Luisetti of Stanford revealed the virtues of the onehanded shot to an amazed Garden audience and became the first major collegiate star. Soon thereafter, Luisetti scored an incredible fifty points against Duquesne, thus ending the East39。s Philadelphia SPHAs (South Philadelphia Hebrew Association)。s World Basketball Association, before the WNBA debuted in 1997 with the support of the NBA. James Naismith, originally from Almonte, Ontario, invented basketball at the International YMCA Training School in Springfield, Massachusetts, in 1891. The game was first played with peach baskets (hence the name) and a soccer ball and was intended to provide indoor exercise for football players. As a result, it was originally a rough sport. Although ten of Naismith39。s basketball league in the United States was the National Basketball League (NBL), which debuted in 1898. Players were paid on a pergame basis, and this league and others were hurt by the poor quality of games and the everchanging players on a team. After the Great Depression, a new NBL was anized in 1937, and the Basketball Association of America was anized in 1946. The two leagues came to agree that players had to be assigned to teams on a contract basis and that high standards had to govern the game。s basketball. Until World War II, basketball became increasingly popular in the United States especially at the high school and college levels. After World War II, its p