A.soda B.hot C.box D.not

●在SQL中，下列涉及空值的操作，不正确的是 (23) 。 (23) A．AGE IS NULL B．AGE IS NOT NULL C．AGE=NULL D．NOT(AGE IS NULL)(23) A．AGE IS NULL B．AGE IS NOT NULL C．AGE=NULL D．NOT(AGE IS NULL)

选出划线部分与其他三项发音不同的一项6.A.soda B.hot C.box D.not A: soda B: hot C: box D: not

——I hope the children won´t touch the dog. ——I´ve warned them ______. A: A.not B: B.not to C: C.not touch D: D.not do

设在某SELECT语句的WHERE子句中，需要对Grade列的空值进行处理。下列关于空值的操作中，错误的是（） A: A.Grade IS not null B: B.Grade IS null C: C.Grade = null D: D.Not(Grade IS null)

Of all the components of a good night's sleep, dreams seem to be least within our control. Indreams, a window opens into a world where logic is suspended and dead people speak. Acentury ago, Freud formulated his revolutionary theory that dreams were the disguisedshadows of our unconscious desires and fears; by thelate 1970s, neurologists had switched tothinking of them as just "mental noise"-the random byproducts of the neural repair work thatgoes on during sleep. Now researchers suspect that dreams are part of the mind's emotionalthermostat, regulating moods while the brain is "off line." And one leading authority says thatthese intensely powerful mental events can be not only harnessed but actually brought underconscious control, to help us sleep and feel better. "It's your dream," says RosalindCartwright, chair of psychologyat Chicago's Medical Center, "if you don't like it, change it." he link between dreams and emotions shows up among the patients in Cartwright's clinic. Mostpeople seem to have more bad dreams early in the night, progressing toward happier onesbefore awakening, suggesting that they are working through negative feelings generatedduring the day. Because our conscious mind is occupied with daily life we don't always thinkabout the emotional significance of the day's events-until, it appears, we begin to dream. And this process need not be left to the unconscious. Cartwright believes one can exerciseconscious control over recurring bad dreams. As soon as you awaken, identify what isupsetting about the dream. Visualizehow you would like it to end instead; the next time itoccurs, try to wake up just enough to control its course. With much practice people can learnto, literally, do it in their sleep. At the end of the day, there's probably little reason to pay attention to our dreams at all unlessthey keep us from sleeping or "we wake up in panic," Cartwright says. Terrorism, economicuncertainties and general feelings of insecurity have increased people's anxiety. Thosesuffering from persistent nightmares should seek help from a therapist. For the rest of us, thebrain has its ways of working through bad feelings.Sleep-or rather dream-on it and you'll feelbetter in the morning. 36.By saying that “dreams are part of the mind's emotional thermostat," the researchers mean that _______. ______ A.we can think logically in the dreams too B.dreams can be brought under conscious control C.dreams represent our unconscious desires and fears D.dreams can help us keep our mood comparatively stable 37.What did Cartwright find in her clinic? ______ A.Most bad dreams were followed by happier ones. B.Divorced couples usually have more bad dreams. C.One’s dreaming process is related to his emotion. D.People having negative feelings dream more often. 38.Cartwright believed with much practice，we can learn to _____. ______ A.control what dreams to dream B.sleep well without any dreams C.wake up in time to stop the bad dreams D.identify what is upsetting about the dreams 39.The author points out that a person who has constant bad dreams should ______ ______ A.learn to control his dreams B.consult a doctor C.sleep and dream on it D.get rid of anxiety first 40.The author most probably thinks that controlling dreams is ______. ______ A.a good practice B.a new discovery C.helpful for everyone D.not essential for everyone

如果ξ与η不相关，则（）。 A: D（ξ+η）=Dξ+Dη B: D（ξ-η）=Dξ-Dη C: D（ξη）=Dξ·Dη D: E（ξη）=Dξ·Dη

已有定义intd=-2;，执行以下语句后的输出结果是：printf('*d(1)=%d*d(2)=%3d*d(3)=%-3d* ',d,d,d,d);printf('*d(4)=%o*d(5)=%7o*d(6)=%-7o* ',d,d,d,d);printf('*d(4)=%x*d(5)=%6x*d(6)=%-6x* ',d,d,d,d);

圆柱螺旋弹簧的旋绕比C是（） A: d/D B: d/D C: D/d D: D/d

已有定义int d= –2；执行以下语句后的输出结果是。 printf(" * d(1) =%d * d(2)= %3d * d(3) =% –3d * "，d，d，d)； printf(" * d(4) =%d * d(5)= %7d * d(6) =% –7d * "，d，d，d)；