首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
15 分 用碘量法测定某铜合金中铜的质量分数w(Cu)/%，6次测定结果如下：60.60, 60.64, 60.58,60.65, 60.57和60.32。 ...
查看本题答案
包含此试题的试卷
国家统考科目《应用题》真题及答案
点击查看
你可能感兴趣的试题
为测定某Cu﹣Zn合金中铜的质量分数某同学将20g该合金放入到盛有80g足量稀硫酸的烧杯中充分反应后
小娟想测定黄铜样品铜锌合金中铜的质量分数.她取该合金的粉末20g与足量的稀硫酸充分反应后经测定产生了
欲测定Cu﹣Zn合金及Cu﹣Ag合金中铜的质量分数实验室只提供一瓶未标明质量分数的稀硫酸和必要的仪器
某化学兴趣小组利用所学知识测定锌铜合金中铜的质量分数1实验前先将锌铜合金在稀硫酸中浸泡片刻其目的是2
为测定锌铜合金中锌的含量取该合金10.0g放入100.0g稀硫酸的烧杯中充分反应后测得杯中剩余物质质
小华测定Cu-Zn合金及Cu-Ag合金中铜的质量分数实验室只提供一瓶未标明质量分数的稀盐酸和必要的仪
合金是建筑航空母舰的主体材料 航母螺旋桨主要用铜合金制造 ①80.0gCu-Al合金用酸完
欲测定Cu﹣Zn合金及Cu﹣Ag合金中铜的质量分数实验室只提供一瓶未标明质量分数的稀硫酸和必要的仪器
小华想测定Cu—Zn合金及Cu—Ag合金中铜的质量分数实验室只提供一瓶未标明质量分数的稀盐酸和必要的
小华想测定Cu-Zn合金及Cu-Ag合金中铜的质量分数实验室只提供一瓶未标明质量分数的稀盐酸和必要的
焊割炬用铜的质量分数不超过多少的铜合金制造
90%
80%
70%
小娟想测定Cu—Zn合金和Cu—Ag合金中铜的质量分数实验室只提供了一瓶稀盐酸和必要的仪器1你认为她
有两块锌铜合金的质量分别为10千克15千克这两块合金的含铜的质量分数不同现分别从这两块合金中各切下
小王同学想测定某CuZn合金中铜的质量分数取合金粉末13g向其中逐渐加入一定溶质质量分数的稀硫酸所
小华想测定Cu—Zn合金及Cu—Ag合金中铜的质量分数实验室只提供一瓶未标明质量分数的稀盐酸和必要的
为测定某Cu-Zn合金中铜的质量分数某同学将10g该合金放入到盛有40g足量稀硫酸的烧杯中充分反应后
为测定某Cu﹣Zn合金中铜的质量分数某同学将10g该合金放入到盛有40g足量稀硫酸的烧杯中充分反应后
为测定某Cu﹣Zn合金中铜的质量分数某同学将10g该合金放入到盛有40g足量稀硫酸的烧杯中充分反应后
某课外小组欲用化学方法测定铜合金中铜的质量分数．现有待测的铜锌合金和铜银合金实验室仅提供稀盐酸和常
小娟想测定Cu-Zn合金和Cu-Ag合金中铜的质量分数实验室只提供了一瓶末标明溶质质量分数的稀盐酸和
热门试题
更多
下列选项中满足短任务优先且不会发生饥饿现象的调度算法是
某机器有一个标志寄存器其中有进位/借位标志CF零标志ZF符号标志SF和溢出标志OF条件转移指令bgt无符号整数比较大于时转移的转移条件是
关于山寨春晚的材料请用网络文化和传媒来写作一篇大于600字的评论
在支持多线程的系统中进程P创建的若干个线程不能共享的是
TCP/IP参考模型的网络层提供的是
假定不采用Cache和指令预取技术且机器处于开中断状态则在下列有关指令执行的叙述中错误的是
主机甲向主机乙发送一个SYN=1seq=11220的TCP段期望与主机乙建立TCP连接若主机乙接受该连接请求则主机乙向主机甲发送的正确的TCP段可能是
取点观察
某计算机存储器按字节编址主存地址空间大小为64MB现用4M×8位的RAM芯片组成32MB的主存储器则存储器地址寄存器MAR的位数至少是
AncientGreekphilosopherAristotleviewedlaughterasabodilyexerciseprecioustohealthBut---__1___someclaimstothecontrarylaughingprobablyhaslittleinfluenceonphysicalfitnessLaughterdoes__2___short-termchangesinthefunctionoftheheartanditsbloodvessels___3_heartrateandoxygenconsumptionButbecausehardlaughterisdifficultto__4__agoodlaughisunlikelytohave__5___benefitsthewaysaywalkingorjoggingdoes __6__insteadofstrainingmusclestobuildthemasexercisedoeslaughterapparentlyaccomplishesthe__7__studiesdatingbacktothe1930’sindicatethatlaughter__8___musclesdecreasingmuscletoneforupto45minutesafterthelaughdiesdown Suchbodilyreactionmightconceivablyhelp_9__theeffectsofpsychologicalstress.Anywaytheactoflaughingprobablydoesproduceothertypesof___10___feedbackthatimproveanindividual’semotionalstate.__11____oneclassicaltheoryofemotionourfeelingsarepartiallyrooted____12___physicalreactions.Itwasarguedattheendofthe19thcenturythathumansdonotcry___13___theyaresadbuttheybecomesadwhenthetearsbegintoflow Althoughsadnessalso____14___tearsevidencesuggeststhatemotionscanflow__15___muscularresponses.Inanexperimentpublishedin1988socialpsychologistFritzStrackoftheUniversityofwürzburginGermanyaskedvolunteersto__16___apeneitherwiththeirteeth-therebycreatinganartificialsmile–orwiththeirlipswhichwouldproducean__17___expression.Thoseforcedtoexercisetheirenthusiasticallytofunnycatoonsthandidthosewhosemonthswerecontractedinafrown____19___thatexpressionsmayinfluenceemotionsratherthanjusttheotherwayaround__20__thephysicalactoflaughtercouldimprovemood
数据链路层采用选择重传协议SR传输数据发送方已发送了0～3号数据帧现已收到1号帧的确认而02号帧依次超时则此时需要重传的帧数是
AncientGreekphilosopherAristotleviewedlaughterasabodilyexerciseprecioustohealthBut---__1___someclaimstothecontrarylaughingprobablyhaslittleinfluenceonphysicalfitnessLaughterdoes__2___short-termchangesinthefunctionoftheheartanditsbloodvessels___3_heartrateandoxygenconsumptionButbecausehardlaughterisdifficultto__4__agoodlaughisunlikelytohave__5___benefitsthewaysaywalkingorjoggingdoes __6__insteadofstrainingmusclestobuildthemasexercisedoeslaughterapparentlyaccomplishesthe__7__studiesdatingbacktothe1930’sindicatethatlaughter__8___musclesdecreasingmuscletoneforupto45minutesafterthelaughdiesdown Suchbodilyreactionmightconceivablyhelp_9__theeffectsofpsychologicalstress.Anywaytheactoflaughingprobablydoesproduceothertypesof___10___feedbackthatimproveanindividual’semotionalstate.__11____oneclassicaltheoryofemotionourfeelingsarepartiallyrooted____12___physicalreactions.Itwasarguedattheendofthe19thcenturythathumansdonotcry___13___theyaresadbuttheybecomesadwhenthetearsbegintoflow Althoughsadnessalso____14___tearsevidencesuggeststhatemotionscanflow__15___muscularresponses.Inanexperimentpublishedin1988socialpsychologistFritzStrackoftheUniversityofwürzburginGermanyaskedvolunteersto__16___apeneitherwiththeirteeth-therebycreatinganartificialsmile–orwiththeirlipswhichwouldproducean__17___expression.Thoseforcedtoexercisetheirenthusiasticallytofunnycatoonsthandidthosewhosemonthswerecontractedinafrown____19___thatexpressionsmayinfluenceemotionsratherthanjusttheotherwayaround__20__thephysicalactoflaughtercouldimprovemood
float型数据通常用IEEE754单精度浮点数格式表示若编译器将float型变量x分配在一个32位浮点寄存器FRl中且x=-8.25则FR1的内容是
AncientGreekphilosopherAristotleviewedlaughterasabodilyexerciseprecioustohealthBut---__1___someclaimstothecontrarylaughingprobablyhaslittleinfluenceonphysicalfitnessLaughterdoes__2___short-termchangesinthefunctionoftheheartanditsbloodvessels___3_heartrateandoxygenconsumptionButbecausehardlaughterisdifficultto__4__agoodlaughisunlikelytohave__5___benefitsthewaysaywalkingorjoggingdoes __6__insteadofstrainingmusclestobuildthemasexercisedoeslaughterapparentlyaccomplishesthe__7__studiesdatingbacktothe1930’sindicatethatlaughter__8___musclesdecreasingmuscletoneforupto45minutesafterthelaughdiesdown Suchbodilyreactionmightconceivablyhelp_9__theeffectsofpsychologicalstress.Anywaytheactoflaughingprobablydoesproduceothertypesof___10___feedbackthatimproveanindividual’semotionalstate.__11____oneclassicaltheoryofemotionourfeelingsarepartiallyrooted____12___physicalreactions.Itwasarguedattheendofthe19thcenturythathumansdonotcry___13___theyaresadbuttheybecomesadwhenthetearsbegintoflow Althoughsadnessalso____14___tearsevidencesuggeststhatemotionscanflow__15___muscularresponses.Inanexperimentpublishedin1988socialpsychologistFritzStrackoftheUniversityofwürzburginGermanyaskedvolunteersto__16___apeneitherwiththeirteeth-therebycreatinganartificialsmile–orwiththeirlipswhichwouldproducean__17___expression.Thoseforcedtoexercisetheirenthusiasticallytofunnycatoonsthandidthosewhosemonthswerecontractedinafrown____19___thatexpressionsmayinfluenceemotionsratherthanjusttheotherwayaround__20__thephysicalactoflaughtercouldimprovemood
临访性心理
某主机的MAC地址为00-15-C5-C1-5E-28IP地址为10.2.128.100私有地址题47-a图是网络拓扑题47-b图是该主机进行Web请求的1个以太网数据帧前80个字节的十六进制及ASCII码内容 请参考图中的数据回答以下问题 1Web服务器的IP地址是什么该主机的默认网关的MAC地址是什么 2该主机在构造题47-b图的数据帧时使用什么协议确定目的MAC地址封装该协议请求报文的以太网帧的目的MAC地址是什么 3假设HTTP/1.1协议以持续的非流水线方式工作一次请求-响应时间为RTTrfc．html页面引用了5个JPEG小图像则从发出题47-b图中的Web请求开始到浏览器收到全部内容为止需要多少个RTT 4该帧所封装的IP分组经过路由器R转发时需修改IP分组头中的哪些字段 注以太网数据帧结构和IP分组头结构分别如题47-c图题47-d图所示
假定在一个8位字长的计算机中运行如下类C程序段 unsignedintx134 unsignedinty=246 intm=x intn=y unsignedintz1=x-y unsignedintz2=x+y intk1=m-n Intk2=m+n 若编译器编译时将8个8位寄存器R1～R8分别分配给变量xymnz1z2k1和k2请回答下列问题提示带符号整数用补码表示 1执行上述程序段后寄存器R1R5和R6的内容分别是什么用十六进制表示 2执行上述程序段后变量m和k1的值分别是多少用十进制表示 3上述程序段涉及带符号整数加/减无符号整数加/减运算这四种运算能否利用同一个加法器及辅助电路实现简述理由 4计算机内部如何判断带符号整数加/减运算的结果是否发生溢出上述程序段中哪些带符号整数运算语句的执行结果会发生溢出
已知序列251310129是大根堆在序列尾部插入新元素18将其再调整为大根堆调整过程中元素之间进行的比较次数是
某计算机有五级中断L4～L0中断屏蔽字为M4M3M2M1M0Mi=10≤i≤4表示对Li级中断进行屏蔽若中断响应优先级从高到低的顺序是L0→L1→L2→L3→L4且要求中断处理优先级从高到低的顺序为L4→L0→L2→L4→L3则L1的中断处理程序中设置的中断屏蔽字是
在编辑把关新闻环境等方面分析新闻失实举例说明
已知有6个顶点顶点编号为0～5的有向带权图G其邻接矩阵A为上三角矩阵按行为主序行优先保存在如下的一维数组中 要求 1写出图G的邻接矩阵A 2画出有向带权图G 3求图G的关键路径并计算该关键路径的长度
AncientGreekphilosopherAristotleviewedlaughterasabodilyexerciseprecioustohealthBut---__1___someclaimstothecontrarylaughingprobablyhaslittleinfluenceonphysicalfitnessLaughterdoes__2___short-termchangesinthefunctionoftheheartanditsbloodvessels___3_heartrateandoxygenconsumptionButbecausehardlaughterisdifficultto__4__agoodlaughisunlikelytohave__5___benefitsthewaysaywalkingorjoggingdoes __6__insteadofstrainingmusclestobuildthemasexercisedoeslaughterapparentlyaccomplishesthe__7__studiesdatingbacktothe1930’sindicatethatlaughter__8___musclesdecreasingmuscletoneforupto45minutesafterthelaughdiesdown Suchbodilyreactionmightconceivablyhelp_9__theeffectsofpsychologicalstress.Anywaytheactoflaughingprobablydoesproduceothertypesof___10___feedbackthatimproveanindividual’semotionalstate.__11____oneclassicaltheoryofemotionourfeelingsarepartiallyrooted____12___physicalreactions.Itwasarguedattheendofthe19thcenturythathumansdonotcry___13___theyaresadbuttheybecomesadwhenthetearsbegintoflow Althoughsadnessalso____14___tearsevidencesuggeststhatemotionscanflow__15___muscularresponses.Inanexperimentpublishedin1988socialpsychologistFritzStrackoftheUniversityofwürzburginGermanyaskedvolunteersto__16___apeneitherwiththeirteeth-therebycreatinganartificialsmile–orwiththeirlipswhichwouldproducean__17___expression.Thoseforcedtoexercisetheirenthusiasticallytofunnycatoonsthandidthosewhosemonthswerecontractedinafrown____19___thatexpressionsmayinfluenceemotionsratherthanjusttheotherwayaround__20__thephysicalactoflaughtercouldimprovemood
某银行提供1个服务窗口和10个供顾客等待的座位顾客到达银行时若有空座位则到取号机上领取一个号等待叫号取号机每次仅允许一位顾客使用当营业员空闲时通过叫号选取一位顾客并为其服务顾客和营业员的活动过程描述如下 cobegin { process顾客i { 从取号机获得一个号码 等待叫号 获得服务 } process营业员 { whileTRUE { 叫号 为顾客服务 } } }coend 请添加必要的信号量和PV或waitsignal操作实现上述过程中的互斥与同步要求写出完整的过程说明信号量的含义并赋初值
某网络拓扑如下图所示路由器R1只有到达子网192.168.1.0/24的路由为使R1可以将IP分组正确地路由到图中所有子网则在R1中需要增加的一条路由目的网络子网掩码下一跳是
某文件占10个磁盘块现要把该文件磁盘块逐个读入主存缓冲区并送用户区进行分析假设一个缓冲区与一个磁盘块大小相同把一个磁盘块读入缓冲区的时间为100μs将缓冲区的数据传送到用户区的时间是50μsCPU对一块数据进行分析的时间为50μs在单缓冲区和双缓冲区结构下读入并分析完该文件的时间分别是
AncientGreekphilosopherAristotleviewedlaughterasabodilyexerciseprecioustohealthBut---__1___someclaimstothecontrarylaughingprobablyhaslittleinfluenceonphysicalfitnessLaughterdoes__2___short-termchangesinthefunctionoftheheartanditsbloodvessels___3_heartrateandoxygenconsumptionButbecausehardlaughterisdifficultto__4__agoodlaughisunlikelytohave__5___benefitsthewaysaywalkingorjoggingdoes __6__insteadofstrainingmusclestobuildthemasexercisedoeslaughterapparentlyaccomplishesthe__7__studiesdatingbacktothe1930’sindicatethatlaughter__8___musclesdecreasingmuscletoneforupto45minutesafterthelaughdiesdown Suchbodilyreactionmightconceivablyhelp_9__theeffectsofpsychologicalstress.Anywaytheactoflaughingprobablydoesproduceothertypesof___10___feedbackthatimproveanindividual’semotionalstate.__11____oneclassicaltheoryofemotionourfeelingsarepartiallyrooted____12___physicalreactions.Itwasarguedattheendofthe19thcenturythathumansdonotcry___13___theyaresadbuttheybecomesadwhenthetearsbegintoflow Althoughsadnessalso____14___tearsevidencesuggeststhatemotionscanflow__15___muscularresponses.Inanexperimentpublishedin1988socialpsychologistFritzStrackoftheUniversityofwürzburginGermanyaskedvolunteersto__16___apeneitherwiththeirteeth-therebycreatinganartificialsmile–orwiththeirlipswhichwouldproducean__17___expression.Thoseforcedtoexercisetheirenthusiasticallytofunnycatoonsthandidthosewhosemonthswerecontractedinafrown____19___thatexpressionsmayinfluenceemotionsratherthanjusttheotherwayaround__20__thephysicalactoflaughtercouldimprovemood
某时刻进程的资源使用情况如下表所示 此时的安全序列是
新闻主题
解释性报道的特点
当系统发生抖动thrashing时可以采取的有效措施是 Ⅰ．撤销部分进程 Ⅱ．增加磁盘交换区的容量 Ⅲ．提高用户进程的优先级
热门题库
更多
高考历史
国家统考科目
香港法概论
反间谍法
__学
合同法
证据学
民事诉讼法学
民法学
刑法学
消费者权益保护法
法理学
竞争法
国际公法
国际经济法
农村政策法规
湘公网安备 43130202000226号