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401
Last year, however, China ousted the US to become the second largest exporter to the emirate with goods worth more than $1 ,000 million, or 8 per cent of Dubai"s total import bill.
402
China Vanke Co. Ltd. , the country s largest property developer by market value, saw its home sales slump 39.3 percent year on year to 12.2 billion yuan ( $1.96 billion) in January.
403
International Airlines Group has reached a provisionaldeal to buy Lufthansa"s UK subsidiary, BMI British Midland.
404
China"s auto industry is switching gears despite sluggish sales in recent months.
405
The strong increase in imports last year is attributed to buoyant economic activity as well as to the success of the Government’s trade and foreign investment policies.
406
If that happens, the backlashfrom Mr. Obama’s supporters could be fearful.
407
While exports are reasonably robust, domestic consumption remains moribund —a sign of the country’s common anxiety about the future.
408
Japanese managers act more like western managers, putting profits before their firm’s market share.
409
Korea’s ambitious plans include a wholesale revamping of the country’s basic industries.
410
America’s embrace of the free-trade agreements balanced all the criticism from the developing countries.
411
More than a decade of fast growth makes China to supplantJapan as West’s main trade worry in Asia.
412
The authorities are willing to permit a run-down in the country’s international reserves over the next few years.
413
Lead values moved up to their best level since April last year in the absence of a settlement at Australia’s broken hill lead-zinc-silver mines.
414
You can use credit cards but it’s best to take some currency as well.
415
As Europe’s economy has soured, free-market ideas that are new to much of Europe face new challenges.
416
Balanced against that criticism is the positive reaction in Latin America to Mr. Clinton’s embrace of the free-trade agreement.
417
Now Zhangjiagang is China’s seventh largest port and atumultuous construction zone of half-built office buildings and hotels
418
The authorities are willing to permit a run-down in the country’s international reserves over the next few years as means of accelerating the introduction of foreign technology.
419
污水来水S≥15 mg/L,认为是来水冲击。
420
计算内径为400mm,流速为 1.2m/s的管路流量?
421
污水在沉砂池中停留()min左右,水平流速为()m/s,去除比的杂质。
422
It will be appreciated if you let us have your offer() men's shirts as soon as possible.
423
The insurance shall be() from the time of the engineer' s departure from China up to thetime of his arrival in China on return.
424
We received a SCIB‘ s Survey Report evidencing a short() of 5 tons of wheat.
425
We are pleased to()you that 6 000 dozen shirts under sales confirmation No. 123, L/CNo. 5678 have gone off on S. S. “Dongfang”.
426
Buyer "s request for insurance to be() up to the inland city.
427
China’s building firm sare() to expand their business abroad, learn the local construction practices and provide their excellent services.
428
For exporters,we usually ask our buyers to open letters of credit() seller' s documentarydrafts at sight.
429
For exporters,we usually ask our buyers to open letters of credit() seller,s documentarydrafts at sight.
430
The() balance of the contract should be transferred to the Seller’s bank by T/T in oneweek.
431
China’s building firms are() to expand their business abroad.
432
China’s building firms are() to expand their business abroad, learn the local construction practice sand provide their excellent services.
433
Goods supplied() credit would exceed the limit should be paid for by banker"s transfer
434
When the seller receives the buyer’s counter-offer, and he finds some terms and conditions unacceptable to him, he will state his own opinions in a letter, which is called as
435
A(n)() is an accounting statement that shows a firm"s status on the last day of an accounting period.
436
The IMF puts China"s share in the world economy at 12.7%, well() Japan"s 7.1% share.
437
采用单缓冲技术,假定从磁盘上读一块数据到缓冲区所需时间为100μs,从缓冲区把数据传送到用户区的时间为40μs,而CPU对这一块数据进行计算的时间为50μs,这样系统对每一块数据的处理时间为()
438
正在运行的进程在信号量S上做P操作之后,当S<0时进程
439
已知一个单链表中,指针q指向指针p的前驱结点,若在指针g所指结点和指针p所指结点之间插入指针s所指结点,则需执行()
440
单链表中,若q所指结点不是最后结点,s指向已生成的新结点,则在q之后插A.s所指结点的正确操作是()
441
设p指向单链表中的一个结点,s指向待插入的结点,则下述程序段的功能是()s->next=p->next;p->next=s;t=p->data;p->data=s->data;s->data=t;
442
在一个单链表中,已知q所指结点是p所指结点的直接前驱,若在p、q之问插入s结点,则执行()操作。
443
在一个链队列中,若f、r分别为队首、队尾指针,则插人s所指结点的操作为()
444
设栈S和队列Q的初始状态为空,元素el,e2,e3,e4,e5和e6依次通过栈S,元素退栈后即进入队列Q,若6个元素的出队序列是e2,e4,e3,e6,e5,e1,则栈S的容量至少为()
445
正在运行的进程在信号量S上作P操作之后,当S<0,进程进入信号量的()。
446
信号量S的初始值为8,在S上调用了10次P操作和6次V操作后,S值为()
447
顺序栈S中top为栈顶指针,指向栈顶元素所在的位置,elem为存放栈的数组,则元素e进栈操作的主要语句为()
448
当某个事务对某段数据加了S锁之后,在此事务释放锁之前,其他事务可以对此段数据加的锁是()
449
有两个关系R和S,分别包含15个和10个元组,则在RUS、R-S、R∩S中不可能出现的元组数目情况是()
450
当关系R和S自然连接时
451
设关系R和S的结构相同,并0.各有80个元组.假如这两个关系做交运算,其运算结
452
已知关系R(A,B)和S(A,B),则以下关系代数表达式中错误的是()
453
班级表的主键是CLASS()NO,学生表的主键是S()NO。并且S()NO对CLASS()NO不存在依赖关系,所以CLASS()NO是学生表的()
454
设教学数据库中有3个关系:学生关系S(SNO,SNAME,AGE,SEX)学习关系SC(SNO,CNO,GRADE)课程关系C(CNO,CNAME,TEACHER)要求S中存储的学生信息满足下列条件:学生年龄在15-25岁之间。那么在关系S的定义的检查子句为()
455
如果要给用户"LI"授予对关系S的查询和更新的权限,其语句是()
456
有关系模式A(C,T,H,R,S),其中各属性的含义是:C:课程T:教员H:上课时间R:教室S:学生根据语义有如下函数依赖集:F={C→T,(H,R)→C,(H,T)→R,(H,S)→R}关系模式A的规范化程度最高达到()
457
有关系模式A(C,T,H,R,S),其中各属性的含义是:C:课程T:教员H:上课时间R:教室S:学生根据语义有如下函数依赖集:F={C→T,(H,R)→C,(H,T)→R,(H,S)→R}现将关系模式A分解为两个关系模式A1(C,T),A2(H,R,S),则其中A1的规范化程度达到()
458
有关系模式A(C,T,H,R,S),其中各属性的含义是:C:课程;T:教员;H:上课时间;R:教室;S:学生。根据语义有如下函数依赖集:F={C→T,(H,R)→C,(H,T)→R,(H,S)→R}。关系模式A的码是()
459
设W=R?S,且W、R、S的属性个数分别为w、r、s,那么三者之间满足()
460
设关系R和S的属性个数分别为r和s,则(RxS)操作的结果的属性个数为()
461
设关系R、S、W各有10个元组,那么这三个关系的自然连接的元组个数为()
462
当关系R和S自然连接时,能够把R和S原该舍弃的元组放到结果关系中的操作是()
463
自然连接是构成新关系的有效方法,一般情况下,当对关系R和S使用自然连接时,要求R和S含有一个或多个共有的()
464
设关系R和S的结构相同,且各有10个元组,那么这两个关系的并操作结果的元组个数为()
465
写出下列SQL查询语句运行结果:SELECTMIN(s()score)FROMstudent;()
466
班级表的主键是CLASS()NO,学生表的主键是S()NO,并且S()NO对CLASS()NO不存在依赖关系,所以CLASS()NO是学生表的()
467
假定学生关系是S(S#,SNAME,SEX,AGE),课程关系是C(C#,CNAME,TEACHER),学生选课关系是SC(S#,C#,GRADE)。要查找选修“COMPUTER”课程的“女”学生姓名,将涉及到关系()
468
设有关系R和S,与R—S等价的元组表达式是()
469
设有关系表S(NO,NAME,AGE),其中AGE为年龄字段,则表达式
470
设关系R和S具有相同的关系模式,则与R∪S等价的是()
471
当关系R和S做自然连接时,能够把R和S原该舍弃的元组放到结果关系中的操作是()
472
当关系R和S自然连接时,能够把R和S原来应该舍弃的元组放到结果关系中的操作是()
473
设有关系R(ABCD)和关系s(BCD),则R×S结果集的元数为()
474
若关系R和S分别包含r和s个属性,分别含有m和n个元组,则R×S
475
事务把数据R的S锁升级为X锁的操作是()
476
要求事务在读取数据前先加共享锁,且读完数据后即可释放S锁,这种封锁协议是()
477
在关系R与关系S进行自然连接时,只把S中原该舍弃的元组保存到新关系中,这种操作称为()
478
将查询关系S的权限授予用户WANG,并允许该用户将此权限授予其他用户。实现此功能的SQL语句是()
479
若关系R和S分别包含r和s个属性,且含有m个公共属性,则?
480
设某数据库中一个表S的结构为S(SNAME,CNAME,GRADE),其中SNAME为学生名,CNAME为课程名,二者均为字符型,GRADE为成绩,数值型,取值范围是0一100,若要把“张一的化学成绩80分”插入S中,则下列语句正确的是()
481
若关系R和S的i至接运算结果中能够保留不满足连接条件的元组,该连接为()
482
集合R与S的交可以用关系代数的基本运算表示为()
483
设关系R有r个属性,关系S有S个属性,其中有一个属性是相同的,经过R和S的笛卡尔积操作后,属性个数是()。
484
设有关系R(ABCD)和关系S(BCD),则RxS结果集的元数为()
485
B/S模式的英文全称是()
486
下列网络应用不属于C/S结构的是()
487
设CSMA/CD局域网中两站间的最远距离为2500m,数据传输速率为1Gbit/s,信号传播速度为200000Km/s,则最小长度应为()
488
最高具有11Mbit/s速率且工作在无需许可的2.4GHz的无线频谱上的无线局域网标准是()
489
设信号传播速度V=2500km/s,链路长度D=500m,链路带宽R=10Mbit/s,则该段链路的时延带宽积为()
490
在分组交换网中,若主机A向主机B传送数据只能经过由3段链路组成的一条路径,其速率分别是R1=500bit/s、r2=2Mbit/s、R3=1Mbit/s,则A到B的最大吞吐量为()
491
若采用4进制数字调制方式使数据传输速率达到4800bit/s,则码元速率应达到()
492
设有长度为1km,数据传输速率为10Mbps的以太网,信号传播速度为200m/μs则求得MAC帧的最小帧长度为()
493
若物理链路长度D=500m,信号传播速度V=2500km/s,则所求传播时延为()
494
设CSMA/CD局域网的数据传输速率为1Gps,信号传播速度为200000km/s,最小帧长度为25000bit,则该局域网中两站之间的最远距离为()
495
假设分组长度L=1000B,链路带宽R=10Mit/s,则所求传输延迟为()
496
下列不是基于B/S模式的开发工作是 ( )
497
下列不是基于B/S模式的开发工作是()
498
Man shall find grace. But he must lay hold of it by an act of free will.The freedom of the will is the keystone of()"s creed.
499
Milton"s Paradise Lost took its material from().
500
()"s literary achievements can be divided into three groups, the early poetic works,the middle prose pamphlets and the last great poems.
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