问题
单项选择题
一般情况下，木结构民用建筑与砖混结构民用建筑之间的防火间距不应小于（）m。
A.6
B.7
C.8
D.9
答案
参考答案：D
解析：本题考查的是建筑防火间距。根据教材表格2-4-4得出木结构民用建筑与砖混结构民用建筑之间的防火间距不应小于9m。故本题答案为D。
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一般情况下，木结构民用建筑与砖混结构民用建筑之间的防火间距不应小于（）m。
A.6
B.7
C.8
D.9
参考答案：D
解析：本题考查的是建筑防火间距。根据教材表格2-4-4得出木结构民用建筑与砖混结构民用建筑之间的防火间距不应小于9m。故本题答案为D。
| 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. |
A．ports
B．streams
C．packets
D．cells