单选

●后缀表达式“

●后缀表达式“ab+cd-*”与表达式(31)对应。 (31)A．(a+b)*(c-d)
B.a+b*c-d
C.a+b*(c-d)
D.(a+b)*c-d

试题出自试卷《2012年上半年软考《程序员》上午试卷（参考答案版）》

参考答案

查看试卷详情

相关试题

●The term, (74) loop, refers to
- ●The term, (74) loop, refers to a loop that is contained within another loop. (74)A.program
- B.nested
- C.statement,
- D.Network
点击查看答案
●The (75)is designed specific
- ●The (75)is designed specifically as a security system for preventing unauthorized communications between one computer network and another computer network. (75)A.firewall
- B.protocol
- C.hacker
- D.virus
点击查看答案
●
- ●A (73) is a named memory block. By using its name, we can refer to the data stored in the memory block. (73)A.word
- B.record
- C.program
- D.variable
点击查看答案
The(71)is
- The(71)is a combination of keys that allows the user to activate a program function without clicking a series of menus options. (71)A.shortcut-key
- B.quick-key
- C.fast-key
- D.rapid-key
点击查看答案
●In computer science ,
- ●In computer science ,a data (72) is a way of storing data in acomputer so that it can be used efficiently. (72)A.record
- B.file
- C.structure
- D.pool
点击查看答案
●
- ●ARP协议属于(69)层，其作用是(70)。 (69)A．传输层
- B．网络层
- C．会话层
- D．应用层 (70)A．由MAC地址求lP地址
- B．由IP地址求MAC地址
- C．由IP地址查域名
- D．由域名查IP地址
点击查看答案
●内联网Intr
- ●内联网Intranet是利用因特网技术构建的企业内部网，其中必须包括(68)协议。 (68)A.TCP/IP
- B.IPX/SPX
- C.NetBuilder
- D.NetBIOS
点击查看答案
●IP地址块192.168.80.128/27包含了(67)个可用的主机地址。
(67)
- ●IP地址块192.168.80.128/27包含了(67)个可用的主机地址。 (67)A.15
- B．16
- C．30
- D．32
点击查看答案
●在HTML文件中，(66)是段落标记对。
(66)
- ●在HTML文件中，(66)是段落标记对。 (66)A.
- B.
- C.
- D.
点击查看答案
●对关系S进行(62)运算，可以得到表1；对关系R和S进行(63)运算，可以得到表2。
(62)A．自然连接
B．投影
C．选择
D．并
(63)A．自然连接
B．投影
C．选择
D．并
点击查看答案