Which of the following types of hydrau

1、Which of the following constraint type

Which of the following constraint types can be used to ensure the value of an INTEGER column references only positive values?（）AUniqueBCheckCReferentialDInformational

2、Of which of the following did the auth

Of which of the following did the author provide a guardedly optimistic view?A［A］GDP growth.B［B］The number of layoffs.C［C］Price indexes.D［D］Output of consumer goods.

3、Which of the following is true of the

Which of the following is true of the OECD report?AIt criticizes government-funded research.BIt introduces an effective means of publication.CIt upsets profit-making journal publishers.DIt benefits scientific research considerably.

4、Which of the listed types of files is

Which of the listed types of files is the best for producing a fine finish on metal?（）AMillBFloatCWardingDSecond cut

5、Which of the following DB2 data types

Which of the following DB2 data types has a fixed length?（）AXMLBBLOBCDOUBLEDDBCLOB

6、Which of the following LSA types desc

Which of the following LSA types describes topology information that, when changed, requires a router in the same area to perform an SPF calculation?（）A 1B 2C 3D 4E 5F 7