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增压缸是由（）缸和（）缸组合而成的。
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A life in filmSteven had to face rejections and obstacles in his film-creating efforts but his persistence and dedication transformed the obstacles into an alternative route to success.[A] At 12 years old, Steven Spielberg was already visiting film shootings at Universal Studios in his office suit, a packed lunch tucked into his briefcase. The young boy tried to immerse himself in film in any way possible. He had been given an administrative job at Universal Studios from a friend of his father's, and every day, even though he didn't have a legitimate security pass, he would try to manipulate his way past the guards and into his personal paradise. Such persistence is hardly surprising from a boy whose lifelong conviction was to "Make sure you are right and go on!" (adopted from a 1954 Disney film).[B] When Steven was eight years old, his father gave him a Brownie 8 mm film camera as his birthday present. Steven immediately began collecting footage of family events, and he simulated action scenes with his miniature toy spacecraft, populating his films with his neighborhood friends as actors. People quickly began to recognize his terrific talent, and he won a prize for cinematography for his early western The Last Gunfight; years later, he won a national contest for his film Escape to Nowhere. His film Firelight was twice analyzed by a national newspaper and was presented in the city theater as if it were a Hollywood premiere. By the time he was 17 years old, Steven had established himself as a director with the artistic intuition of a man twice his age.[C] His achievements are certainly related to the personal obstacles and setbacks he faced from an early age. Steven's family moved often, so that he was constantly trying to find his place in a turbulent environment with new people. Despite his natural intelligence, Steven had a carefree attitude and put little effort into school. He consistently earned only a C average, or lower. Socially, he wasn't athletic or popular, and since his conspicuous interest in film made him seem eccentric, classmates shunned and mocked him.[D] His home life was not ideal either, as his father's rigid engineering temperament could not understand his or his mother's artistic personalities. Steven would miss his father when he was gone for long work trips, and then reverted to furiously arguing with him as soon as he returned. Finally when he was in high school, his parents ended their unhappy marriage with a divorce. The theme of the lack of a father figure consistently infected Steven's films.[E] Unfriendly surroundings at home and school made Steven strive even harder to achieve in the film world. He applied to two of the best film schools in the country: the University of Southern California and the University of California, Los Angeles. But even with a formidable 10 years of experiences in filmmaking and his friends at Universal Studios endorsing him, his grades were too poor and he was flatly turned down at both institutions.[F] Unwilling to give up, Steven entered the California State University, where he hoped the program in TV and radio might open his way to Hollywood. Unfortunately, the university was not suited to his experience, and one academician recalled "Steven knew more about cameras, mounts, and lenses than anyone else in the department. He could teach there." Despite his manifest talent, his low grades sabotaged transfer attempts, forcing real film schools to withhold acceptance.[G] Steven contrived to rectify the situation on his own by diverting his attention away from academics. He cleaned his old suit and briefcase and returned to visiting Universal Studios where he had worked as a boy. He discreetly sneaked into any department he could, such as shooting rooms, editing and sound-mixing studios, and he quietly watched until he was discovered and ordered to leave. Introducing himself under the pretext of being either an actor, director, or producer, he would invite people to dinner to make connections and learn as much as he could. Even though he was caught and expelled at least once a day, he always returned to smuggle himself back in again.[H] Steven repeatedly tried to prove himself to the Universal executives, while working in a cafeteria to save up money for equipment. He would discretely create scenes and then shoot and re-shoot his movies. He kept upgrading from 8 to 16 and finally 35 mm film before he was allowed a screening. Finally his film Amblin was given a chance in front of the executives. It was a short, silent film and the plot differed greatly from the sci-fi and combat films that would later predominate Steven's career. Still the short film was awesome enough to win Steven, only 21 years old, a seven-year contract with Universal Studios.[I] After directing smaller TV dramas and low-budget projects, Steven earned the chance to direct his big Hollywood debut: a thriller film starring a shark! Jaws was a box office hit and it made Steven famous. He continued his relationship with Universal Studios to produce the notable movies E.T., Jurassic Park, and Schindler's List.[J] As his first producer said, "It is not by any coincidence that Steven is in his present position." Instead, it is Steven's committed spirit that has strengthened him in standing fast against all rejections, prejudice and skepticism and driven him to keep moving onward.____1. An academician regarded that Steven Spielberg was so experienced in shooting films that the study in the California State University was not suited to him.____2. Steven’s accomplishments were not achieved by chance but for his own committed spirit.____3. Steven Spielberg tried any way to visit film shooting at Universal Studios when he was a young boy.___4. His father’s frequent absence in his early life had great impact on the theme of Steven’s films.___5. Steven Spielberg was avoided and laughed at by his classmates when he was in school..___6. Steven Spielberg’s short film Amblin was good enough to win him a seven-year contract with Universal Studios.___7. Steven Spielberg won a prize for cinematography because his outstanding talent shown in his early western The Last Gunfight.___8. It was a thriller film starring a shark that made Steven famous.___9. Steven managed to change the situation by himself after going through so many failures in academics.___10. Steven didn’t get admitted to the best two institutions because of his low grade.
若时间序列变量Xt是弱平稳的,则下列说法错误的是 ( )
关于DF检验说法正确的是( )
下列各项费用中，不属于保管费用的是（）。
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