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下列叙述中哪项与盐酸哌替啶不符
A．分子中含有酯基，在酸、碱性中均易水解
B．结构中含有苯环及哌啶环
C．水溶液加Na2C03有油滴状物析出，放置凝为固体
D．放置时间过长或遇光易变黄
E．镇痛作用只有吗啡的1/10，成瘾性也比吗啡弱
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更多“下列叙述中哪项与盐酸哌替啶不符A．分子中含有酯基，在酸、碱性…”相关的问题
A.又名度冷丁
B.易吸潮，遇光易变质
C.结构中含有苯环与吡啶环
D.在体内代谢时，主要是酯水解和Ⅳ-去甲基化产物
E.镇痛活性仅为吗啡的l／10，且成瘾性弱
A．1-甲基－4－苯基－4－哌啶甲酸甲酯
B．1-乙基－4－苯基－4－哌啶甲酸乙酯
C．1-(β-氨基苯乙基)－4－苯基－4－哌啶甲酸乙酯
D．1-(3-苯胺丙基)－4－苯基-4－哌啶甲酸乙酯
E．1-甲基－4－苯基－4－哌啶甲酸乙酯
Speaker B: ______
A．Do you have any friends in Japan？
B．85 cents per pound, but the limit is 11 pounds per package if you want it to go book rate.
C．I'm afraid it will take about days for these books to reach Japan.
D．The rate for surface mail is cheaper than that for airmail, but surface mail takes longer.
A．had contributed.
B．contributed
C．were contributed
D．did contribute
Next year, for the first time, sales of movies in DVD format are forecast to outsell those on video cassette in America, reaching a total of $9.5 billion, according to Morgan Stanley, an investment bank. Already, 80% of American households have DVD players. With a DVD recorder now in the shops as well, something that can record from the TV as well as play the discs, Christmas sales are expected to be strong. A technology considered a flop when it was launched in 1997 is now the basis for the fastest-growing consumer appliance ever.
Some in the film business complain that people are simply buying DVDs instead of video cassettes: there is no net gain. Yet DVDs can do things that the cassette cannot, such as offer a choice of language in which to watch a movie, not to mention a clearer picture. And the studios have cleverly stuffed DVDs full of lively extra features, such as new clips or interviews with the director.
Moreover, people appear to want to build up collections of DVDs, rather as they do of recorded music. The DVD is steadily gaining shelf space, even in the movie-rental store, and it should overtake (赶上，追上) the cassette even there within three years. And shops like DVDs, not least because they take up less space. The DVD could well boost the size of the overall home-video market.
Already, recent releases on DVD, such as Snow White and the Seven Dwarfs and Star Wars Episode One, have sold millions of copies each. At a time when any revenue growth in the media industry is startling, DVD sales at AOL Time Warner jumped by 44% in the third quarter this year, compared with the same period of 2000, to $279 m.
But how lasting will the DVD effect be？ Some 80% of a film's revenue comes from its distribution after the cinema release: to home video, pay-TV and the like. "The largest single portion of that revenue will be the DVD business," says Christopher Dixon of UBS Warburg, an investment bank, which in turn will help to reduce the risk involved in making movies. "The DVD is the most exciting development in the film industry," he adds, "but every eight years there has been a new distribution platform. in the entertainment business. None of them lasts forever. "
It is predicted that movies in DVD format ______ .
A．will sell better than those on video cassette
B．can't compete with those on video cassette
C．will face a tough market
D．will become good Christmas gifts
A．Cars, space planes, maglev trains.
B．Planes, maglev trains.
C．Rockets, maglev trains.
D．Space planes, maglev trains.
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