下列关于珠江三角洲和长江沿江地带，说法正确的是 A．长江沿江地带沟通沿海经济地带

烹饪是科学与美学的综合，技术与艺术的统一。

投资控制工作的重心应是项目的招投标及项目实施阶段。( )

A transport layer protocol has several responsibilities. One is to create a process-to-process (program-to-program) communication, TCP uses port (1) to accomplish this. Another responsibility of a transport layer protocolis to create a  (2) and error-control mechanism at the transport level. TCP uses a sliding(3) protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve(4) control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends  (5) 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.

空白（2）处应选择（）

A.procedure

B.function

C.route

D.flow

轮迹横向分布系数

共享变量是指如何访问的变量

A．只能被系统进程

B．只能被多个进程互斥

C．只能被用户进程

D．可被多个进程