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若船舶在一港调换船员达（）以上时，应于离港后24小时内作一次救生演习。

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标准体系本质上具有"（）"的特征。

A. 系统
B. 整体
C. 统一
D. 协调

灭火器火灾原则是：先切断电源，在进行补救.

A. 正确
B. 错误

消防员装备中个人配备由（）组成。

A. 防护服、消防靴、手套、消防头盔
B. 认可型的安全灯
C. 消防手斧
D. 上述C组合

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（4）处应选择（）

A. packet
B. time
C. error
D. phase