题目内容

便携式泡沫发生器灭油类火灾时，应对准着火后的舱壁或火场中物体的垂直面等喷射，使泡沫均匀流下覆盖液面.

A. 正确
B. 错误

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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 protocol is 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（5）处应选择（）

A. ports
B. streams
C. packets
D. cells

（）意味着两个方面的进展，建立现代民主制度，明确公民自由权力，并从政治，经济，法律，社会等多重角度，为之设立保护屏障。

19实际，由于（）的发展，教育的普及，社会等级观念的淡化以及公民选举权的扩大，民主得到了真正开发的机会，从而在欧美发达国家实现了从理论向制度的转化。