● (71) means that a program written for one computer system can be compiled and run on another system with little or no modification.
(71)
A. Portability
B. Reliability
C. Availability
D. Reusability
第1题:
A、an,some
B、a,one
C、a,/
D、any,one
第2题:
编译和执行以下代码,输出结果是( )。 int i=1; switch (i) { case 0: System.out.print("zero,"); break; case 1: System.out.print("one,"); case 2: System.out.print("two,"); default: System.out.println("default"); }
A.one,
B.one,two,
C.one,two,default
D.default
第3题:
3、3. PLC处于()模式时,允许进行自由端口通讯。 A.RUN模式 B.PROGRAM模式 C. 监控模式 D.都可以
A.RUN模式
B.PROGRAM模式
C.监控模式
D.都可以
第4题:
下面程序的输出结果是( )。 public class Sun { public static void main(String args[ ]) { int i = 1; switch (i) { case 0: System.but.println("zero"); break; case 1: System.out.println("one"); case 2: System.out.println("two"); default: System.out.println ("default"); } } }
A.one
B.one, default
C.one, two, default
D.default
第5题:
A transport layer protocol has several responsibilities. One is to create a process-to-process (program-to-program) communication; TCP uses port (71) to accomplish this. Another responsibility of a transport layer protocol is to create a (72) and error-control mechanism at the transport level. TCP uses a sliding (73) protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve (74) control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends (75) of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.
(71)
A.numbers
B.connections
C.diagrams
D.resources
第6题:
3. PLC处于()模式时,允许进行自由端口通讯。 A.RUN模式 B.PROGRAM模式 C. 监控模式 D.都可以
A.RUN模式
B.PROGRAM模式
C.监控模式
D.都可以