更多“曲线与曲线有公切线，则a=____． ”相关的问题
按照抗震要求，圆柱的直径，不超过2层时不宜小于（）
A . 350mm
B . 450mm
C . 400mm
D . 500mm
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有关Wilson’s病以下哪一项描述是错的：（）
A.是一种铜代谢障碍的隐性遗传性疾病，精神症状可出现于疾病早期 B.可表现为情绪障碍、幻觉妄想、人格改变及智能减退 C.锥体外系症状，如肌痉挛、震颤、强直和运动减少是常见症状 D.治疗应以补充血铜为主 E.K-F环和尿与大便铜排泄量增加以及血浆铜蓝蛋白减少可确诊
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英镑、欧元和日元的英文简写分别是（）
A、GDP、EOR、JPY
B、GBP、EOR、JPK
C、GBP、EUR、JPY
D、GDP、EUR、JPK
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It takes a whole galaxy of things to make you happy. Happiness is a state you feel when you have no problems, worries, doubts or other negative things affecting your life. You do not need to receive great news, excitement or wealth: it comes from enjoying life whatever it brings. Someone who has mastered the art of happiness will enjoy sitting with a cup of coffee and a cheese sandwich. The person who has mastered being sad will always want more and dream of more but never achieve it. A person who has won a fortune on the lottery might be happy, but if they then begin to worry about the best way of looking after that money, whether or not to invest all of it or most of it, where to invest it or how to get rid of the many people who pester them for hand outs, their happiness might be short lived. Another person might be happy because they enjoy their job, have some great friends and a wonderful partner and no debts. In a way the more we want and the more we think we are entitled to, the less likely we are to be happy. If we can accept that we will have bad days as well as good days, and that nobody" s life runs smoothly, then we have the key to happiness. If we are proactive about defining our goals and making them happen we are more likely to be happy. Contrary to popular belief happiness is not about being rich, young, good looking, fit and healthy. There are people who are blind, very poor and have lots of problems, yet they are happy because they make the most of their lives, concentrate on the good things and do what they can about the bad. Instead of worrying about all sorts of things that might never happen or dwelling on the negatives in their life, they are grateful for anything good and nice that comes their way. Happiness is about being proud of who you are, respecting yourself, respecting your background, your persona and all that goes with it. Not how much money you have or how hard you work. Many convince themselves that they will be happy next year or when they retire and have a lot more time. But then when the year is up or they retire they are still not happy. That is because they do not see the good in things.
A．has achieved his dreams and made a lot of moneyB．has fewer desires and devotes all his efforts to workC．spends more time to enjoy all the good things in lifeD．takes a positive attitude toward everything in his life
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患者男性，42岁。右胸被锐器刺伤，半小时后被送入急诊室。体检： 血压90/60mmHg,呼吸困难，肋间隙饱满，气管向左侧移位。下列哪种情况为进行性血胸（）
A.引流量每小时50ml
B.引流量每小时100ml
C.引流量每小时150ml
D.引流量每小时200ml
E.引流量每小时300ml
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消费者停留时间长、人均消费相对较高，对社区经济的带动作用最为明显的乡村旅游产品是（）。
A.乡村观光旅游产品B.乡村度假旅游产品C.乡村体验旅游产品D.乡村养生保健旅游产品
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用示波器分别测得某NPN型管的共射极基本放大电路的三种不正常输出电压波形如图所示。试分析各属于何种失真？如何调整电路参数来消除失真？
用示波器分别测得某NPN型管的共射极基本放大电路的三种不正常输出电压波形如图所示。试分析各属于何种失真？如何调整电路参数来消除失真？
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纳税人被工商行政管理机关吊销营业执照或者被其他机关予以撤销登记的，应当自营业执照被吊销或者被撤销登记之日起（）内，向原税务登记机关申报办理注销税务登记
A.15日
B.30日
C.60日
D.10日
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以下哪个三维实体可以用两个参数进行绘制的（）
A.球体
B.圆柱体
C.圆环体
D.圆锥体
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下列不属于格里菲斯的贡献是（）。
A.情节平行交叉剪辑
B.理念平行交叉剪辑
C.线索平行交叉剪辑
D.故事平行交叉剪辑
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水利建设市场主体信用信息包括( )。
A．基本信息
B．良好行为记录信息
C．不良行为记录信息
D．优良行为信息
E．恶意行为信息
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(翻译)亲爱的魏华小姐：非常感谢你盛情邀请于 4月12日去你家赴便宴，我和我夫人六点以前到达。乔治·史斯密
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