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【单选题】
执行多段线编辑（PEdit）命令时，对于【合并（J）】对象之间的关系，下列说法正确的是（）A.
必须端点重合
B.
端点可以不重合
C.
端点重合一定可以合并
D.
合并后图形对象属性没有任何变化
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反馈参考答案：
举一反三
【简答题】在考生文件夹下SPID文件夹中新建一个名为USENET的文件夹。
【单选题】Special data that describe the data contained in a database are called ________.
A.
open matrices
B.
primary data
C.
metadata
D.
closed matrices
【单选题】Accessing data from a floppy disk is called( )data.
A.
printing
B.
reading
C.
writing
D.
listening
【单选题】The so-called data encapsulation is to assemble a group of data and related operations together to form an entity, which is also known as ( ).
A.
class
B.
object
C.
the function body
D.
data block
【单选题】When building a warehouse, the process of reformatting data so that it conforms to set standards is called ________.
A.
extraction
B.
transformation
C.
loading
D.
normalization
【简答题】使用水基清洗剂时一般应[2分]
【单选题】The formatting process also looks for defective areas of the disk, called ___,?and cordons them off so data cannot be stored there.
A.
bad sectors
B.
bad tracks
C.
warped data
D.
warped links
【单选题】In the data link layer, the data unit is called(71)．
A.
flame
B.
Packet
C.
Signal
D.
APDU
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