【简答题】计算机网络系统具有丰富的功能,其中最重要的功能是______和______。
【简答题】For this part, you are allowed 30 minutes to write a composition on the topic What Are College Students Doing on the Internet? You should write at least 150 words according to the outline given below ...
【单选题】If a unique constraint is defined on column COL1 of table TAB1, what are the characteristics of COL1?()
A.
COL1 will accept NULL values and can be referenced in another table's foreign key specification.
B.
COL1 will not accept NULL values and cannot be referenced in another tables foreign key specification.
C.
COL1 will not accept NULL values and can be referenced in another tables foreign key specification.
D.
COL1 will accept NULL values and cannot be referenced in another tables foreign key specification.
【简答题】计算机网络系统具有丰富的功能,其中最重要的是通信和______。
【单选题】In the future robots will also
D.
do all of the housework.
【简答题】计算机网络具有丰富的功能,其中最重要的是通信和__________。
【单选题】---- What do you think of Andrew? ---- There are some things that are not easy to ______ and his coldness is one.