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22001A beam of electrons bombards a sample of hydrogen.Through what potential difference must the electrons have been accelerated if the first line of the Balmer series is to be emitted？（）
22002A proton and an electron， both at rest initially， combine to form a hydrogen atom in the ground state.A single photon is emit- ted in this process.What is its wavelength？（）
22003What fraction of a beam of 7.7-MeV alpha particles incident upon a gold foil 3.0×10-7 m thick is scattered by less than 1°？（）
22004Which of the following is not a valid conclusion from Rutherford’s alpha particle scattering experiment？（）
22005A 5.0-MeV alpha particle approaches a gold nucleus with an impact parameter of 2.6×10-13 m.Through what angle will it be scattered？（）
22006For an 8.0-MeV α particle scattering from a gold atom（Z = 79 ） of radius 0.135 nm， the largest scattering angle， θ is ？（）
22007The mass of a proton is（）
22008The mass of a single iron atom is 9.3 × 10–23 g.Determine the number if iron atoms in regular cube that measures exactly 10 cm on an edge.The density of iron is 7.86 g/cm3（）。
22009通过浓度三角形A点的线上的合金成分
22010在做药物实验的时候，两组实验数据都说明A的药效好，就说明A的药效是好的。（）
22011如果 P(A n B)= P(A)P(B)，则称 A、B是独立的。
22012语音信号的量化，通常采用ITU建议的具有（）特性的非均匀量化方法，即A律和μ律。
22013设某信息源由A、B、C、D、E五个信息符号组成，发送A的概率为1/2，发送其余符号的概率相同，且设每一符号的出现是相互独立的。则每一符号的平均信息量为（）。
22014A tender tooth is（）.
22015A specialist in diseases of the lower urinary tract， bladder and urethra， is called a（）.
22016A procedure that allows a physician to look into the bladder and examine its interior is termed a（）.
22017Presence of a kidney “stone” is termed（）.
22018A sheet or band of fibrous tissue which lies deep to the skin or forms an investment for muscles and various organs of the body is（）.
22019Grafts used for transplantation from a different species are（）.
22020The movement of a microorganism or cell in response to a chemical stimulus is termed（）.
22021Gastrojejunostomy describes a procedure that（）
22022（） is a hormone secreted by the thymus that can stimulate the immunological activity of lymphoid tissue.
22023Which of the following word parts indicates the first part of a small intestine？
22024A special procedure to examine the blood vessels of the lungs by X-ray is called
22025A bluish discoloration of the skin and mucous membranes is termed（）， which is a sign that oxygen in the blood is dangerously diminished（as in carbon monoxide poisoning）.
22026Hemoptysis is a term describing（）.
22027A faster than normal respiratory rate of breathing is termed（）.
22028A record of electric wave occurring in the brain is called（）.
22029Which of the following word parts is a combining form？
22030A newborn baby is with reddish purple marks on the face， which is caused by a localized area of abnormal blood vessels.This condition is called（）.
22031In the brain， there is a region involved in memory forming， organizing， and storing， which is called the（）because it has a shape of a seahorse.
22032A boy always feels tired.Blood test shows that he is not iron deficient， but his MCV（平均红细胞体积）is very low.The name of this condition derives from the Greek Thalassa sea.What may be the possible diagnosis of him？
22033A senior woman always repeats statements and questions over and over， not realizing that she has asked the question before.She tends to forget conversations， appointments or events.This woman may be diagnosed with（）.
22034A 18-year-old man has an exaggerated sense of self-importance and always believes that he is better than others.This man may be diagnosed with having a（n）（）.
22035对于A、B两种难溶盐，若A的溶解度大于B的溶解度，则必有（）
22036反应A + B → C，若是基元反应，该反应只能是二级反应。（）
220372mol A和1mol B在1L容器中混合，假定A与B反应的速率控制步骤是2A（g） + B（g）→ C（g），其反应速率系数为k，则A和B都用去2/3时的反应速率u为（）。
22038三相桥式全控整流电路自然换相点是a=0o。
22039三相半波可控整流电路中如果三个晶闸管采用同一组触发装置，则a角的移相范围是（）
22040单相半波可控整流电路中，阻感性负载，若a为定值，φ越大，则导通角θ（）
22041单相半波可控整流电路中电阻性负载，则a角的移相范围是（）
22042《铁道游击队》一片中，导演利用将战前的训练环节和实战的检验环节紧密的连接起来，采用的时空压缩手法是（）A 借物暗示 B 错觉转场 C 相似镜头
22043能够形成审视和批判感觉的镜头是：A 仰拍镜头； B 平拍镜头 C 俯拍镜头 D 背面镜头
22044He that travels far knows much， or a real wiser who travels thousands of miles learns more knowledge that those who read ten thousand books的翻译是读万卷书不如行万里路。
22045两个容量瓶，分别标记为a、b，在a容量瓶中加入Cd2+未知液5.0mL，加水稀释至刻度后测得扩散电流为10 μA，在b容量瓶中加入Cd2+未知液5.0mL，再加0.005mol/L Cd2+标准溶液5.0mL，加水稀释至刻度后测得扩散电流为15 μA，则未知溶液中Cd2+的浓度为
22046某分配色谱中，a、b、c、d和e五个组分的分配系数K分别为360、473、480、490和496，则它们在色谱柱上流出的先后顺序是
22047某有色溶液的吸光度A为0.300，则在同样条件下该溶液的透光度T为
22048There is a 200 - square - meter training room in the fitness center on board.
22049Although the pictures taken are also a good souvenir， we often feel sorry because the pictures are not good enough on the cruise ship？（）。
22050What is the first thing that when we want a photo on the ship？
22051Photos are not only a souvenir， but also a work， a witness of a good mooD.
22052Male guitarists occasionally sing a song with silky voice， gorgeous and retro.If anyone stops， his smiling eyes will always stay for a long time.
22053At the beginning of the 20th century， a large luxury cruise ship called "； Titanic"； aroused people'；s imagination of the prosperous dream of sailing tourism.
22054Is the beer a kind of alcohol drink？（）。
22055Is the juice a kind of non- alcohol drink？（）。
22056Chewing food with your mouth open is a bad table manner.
22057You can take a drink when you have food in your mouth.
22058Dinner can be delayed more than 15 to 20 minutes to accommodate a late guest'；s arrival.
22059At a formal event， the dessert fork is laid on the left side of the plate.
22060In general， a lengthy table requires a short overhang and a small table a short drop.
22061Who is the head of food and beverage department on a cruise ship？
22062The main course is usually the lightest， heartiest， and most complex or substantive dish on a menu.
22063Which is the second course in a multi-course meal？
22064If you expect to have a special dining experience， and taste delicious food from different countries， you can go to（）.
22065If you have a tight budget， you can choose a（）.
22066Room service is available 24 hours a day on all the ships.
22067If a passenger takes some valuable goods， he or she should declare to avoid imposing tariffs when return from abroaD.
22068If you want to buy a watch on the ship， what kind of brand can you find？
22069A cruise ship with 5000 passengers produces about 965，277 litres of reusable wastewater every day.
22070What condition that water masses in the ocean flow steadily in a certain direction？
22071（）在2014年被联合国正式聘为“城市可持续发展宣传大使”？、A.任正非
22072A/D转换过程中，将输入模拟量转换为在时间上离散的模拟量的过程称为（）。
22073并行比较型、逐次比较型和双积分型三种A/D转换器中，转换速度最高的为双积分型。
22074对于一个D/A转换器，若要求其转换分辨率达到0.4%，问应采用（）位的D/A。
22075如果要将一个最大幅值为5.1V的模拟信号转换为数字信号，要求模拟信号每变化20mV能使数字信号最低位发生变化，那么应选用（）位的A/D转换器。
22076若4位倒T形电阻网络D/A转换器，输入数字量0001时对应的输出电压为0.1V，则输出电压为1.2 V时，输入数字量应为（）。
22077在进行A/D转换时，必须将取样电压表示为某一最小单位的整数倍，这个转化过程称为（）。
22078有一个6位D/A转换器，设满量程输出为6.3V，输入数字量为110111，则输出模拟电压为（）。
22079若4位倒T形电阻网络D/A转换器，输入数字量0010时对应的输出电压为0.2V，则输入数字量为1010时，输出电压应为（）。
22080D/A转换器的功能是把数字信号转换成模拟信号
22081函数F(A,B,C)=AB+BC+AC的最小项表达式为 。
22082乙酰辅酶A羧化酶是脂肪酸从头合成的关键酶。
22083维生素A在维持暗视觉中直接发挥作用的形式是（）。
22084A/D转换器在转换过程中必然出现量化误差。
22085以下四种转换器中，（）是A/D转换器且转换速度最高。
22086D/A转换器的分辨率取决于（）。
22087已知“a=1b’1；b=3b'；001；”那么{a，b}＝（）。
22088在verilog语言中，a=4b’1011，那么&；a=（）。
22089如图所示电路均为TTL电路，能显示F=A'；功能的电路是（）。
22090A，B，C是输入变量，Y是输出变量，请写出Y的最简或与表达式。
22091D/A转换器是工作在输入通道，A/D转换器是工作在输出通道。
22092D/A和A/D的技术指标中的分辨率是指数字量对应于模拟量的分辨能力。
22093DAC0832是八位D/A转换器，片内有两个缓冲器，可以工作在单缓冲、双缓冲及直通方式。
22094已知模糊集合A表示“大苹果”，则加了语气算子的模糊集合B“很大的苹果”，B中的元素隶属度等于A中元素隶属度加（1/2）次方运算。
22095模糊集合表示为A=u1/x1+u2/x2+u3/x3+……，其中u代表隶属度，x表示论域元素，式子中的加号和除法和数学中的表示含义相同。
22096设有两个定义在相同论域上的模糊集合A=[0.2 0.4； 0.6 0.9]， B=[0.8 0.7； 0.5 0.3]，则A合成B的结果为（）
22097设有两个定义在相同论域上的模糊集合A和B，A合成B的结果等于B合成A的结果。
22098We wish to introduce ourselves to you as a… 我们希望介绍你们作为……。
22099I' m in favor of it.It' s a great idea.我赞成。是个好主意。
22100This is a kick off meeting for the new program.我们会把一个新的项目从会中踢出局。
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