In data communication, data link is those parts of two data terminal equipments that are controlled by a protocol along with the(71) data circuit, which together enable data(72). So-called protocol means, in short, a set of rules that determines the behavior. of functional units in achieving communication.Data circuit, however, consists of a pair of(73) transmission channels that provides a means of two-way data transmission. Between data switching exchanges, the data circuit may or may not include data circuit-terminating equipment (DCE), depending on the type of(74) used at the data switching exchange. Between a data station and a data switching exchange or data concentrator, the data circuit includes the DCE at the data station end, and may include equipment(75) to a DCE at the data switching exchange or dam concentrator location.
A.handshaking
B.interconnecting
C.linkage
D.joining
第1题:
若要对Data类中重载的加法运算符成员函数进行声明,下列选项中正确的是( )。
A.Data+(DatA.;
B.Data operator+(DatA.;
C.Data+operator(DatA.;
D.operator+(Data,DatA.;
第2题:
在有13个元素构成的有序表data[1..13]中,用折半查找(即二分查找,计算时向下取整)方式查找值等于data[8]的元素时,先后与(41)等元素进行了比较。
A.data[7]. data[6]. data[8]
B.data[7]. Data[8]
C.data[7]. data[10]. data[8]
D.data[7]. data[10]、data[9]. data[8]
第3题:
第4题:
设链式栈中结点的结构为(data,link),且top是指向栈顶的指针。若想摘除链式栈的栈顶结点,并将被摘除结点的值保存到x中,则应执行的操作是(32)。
A.x=top->data;top=top->link;
B.top=top->link;x=top->data;
C.x=top;top=top->link;
D.x=top->data;
第5题:
第6题:
将数据库导入R语言后,可用()显示数据库结构,用()查看数据库行列数,用()查看每个变量的基本统计值。
A.str(data) summary(data) dim(data)
B.str(data) dim(data) summary(data)
C.dim(data) summary(data) str(data)
D.summary(data) dim(data) str(data)