使用命令行delete_block（’blk’)，其功能描述为（）

数控机床的开关扳到BLOCK DELETE时，程序执行(  )。

  A．所有命令  B．带有“/”的语句

  C．没有“/”的语句 D．不能判断

______ processing offers many ways to edit text and establish document formats. You can easily insert, delete, change, move and copy words or blocks oftext.

  A．Data  B．Database  C．Word  D．File

______ processing offers many ways to edit text and establish document formats．you can easily insert, delete, change, move and copy words or blocks of text.

A．Data

B．Database

C．Word

D．File

A. The shrink operation touches every block in the BOOKING table

B. The high-water mark (HWM) for the BOOKING table is shifted from its original position

C. The progress of the shrink operation is saved in the bitmap blocks of the BOOKING table

D. The data manipulation language (DML) triggers on the BOOKING table are executed because the shrink operation is internally handled by the INSERT/DELETE operation

A.TheshrinkoperationtoucheseveryblockintheBOOKINGtable

B.Thehigh-watermark（HWM）fortheBOOKINGtableisshiftedfromitsoriginalposition

C.TheprogressoftheshrinkoperationissavedinthebitmapblocksoftheBOOKINGtable

D.Thedatamanipulationlanguage（DML）triggersontheBOOKINGtableareexecutedbecausetheshrinkoperationisinternallyhandledbytheINSERT/DELETEoperation

A.Thecorrespondingindexesforthetablearealsotruncated.

B.DeletetriggersonthetablearefiredduringtheexecutionoftheTRUNCATEcommand.

C.ThechildtableistruncatedwhentheTRUNCATEcommandisappliedontheparenttable.

D.Thehigh-watermark（HWM）issettopointtothefirstusabledatablockinthetablesegment.

E.NoundoorverylittleundodataisgeneratedduringtheexecutionoftheTRUNCATEcommand

Direetions: This part consists of a short passage. In this passage, there are altogether 10 mistakes, one in each numbered line. You may have to change a word, add a word or delete a word. Mark out the mistakes and out the corrections in the blanks provided, if you change a word,cross it out and write the correct word in the corresponding blank. If you add a word, put at insertion mark (/1) in the right place and write the missing word in the blank. If you delete a word, cross it out and put a slash (/) in the blank.

Example:

Television is rapidly becoming the literature of our periods. (1). time/times/period_

Many of the arguments having used for the study of literature (2). /_______

as a school subject are valid for/l study of \'television. (3). the

Britain almost more than any other countries in the world must

seriously face the problem of building downwards, that is to say, of 1_______

accommodating a considerable proportion of its population in high

blocks of flats. It is said that the English man objects against this type 2._______

of existence, but if the case is such, he does in the fact differ from 3._______

the inhabitants of most countries of the world today. In the past our

own blocks of flats have been associated with the lower-income groups,

and they had lacked the obvious provisions, such as central heating, 4._______

constant hot water supply, electrically-operated lifts from top to bottom, as well as such details as easy facilities for disposal of dust and rubbish and storage places for baby carriages in the ground floor, playgrounds

for children on the top of the buildings, drying grounds for washing. 5_______

It is likely that the dispute regarding flats versus individual houses

will continue to rage for a long time as far as Britain is concerning. 6._______

And it is fortunate that there should be hot feelings on both sides 7._______

whenever this subject is raised. Those who oppose the building of

flats base their case primarily in the assumption that everyone prefers 8._______

an individual home and garden and on the high cost per unit of

accommodation. The latter ignores the higher cost of providing full

services to a scattered community and the cost in either money and 9. _______

time of the journeys to work for the urban resident. 10._______