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问题 单项选择题

TCP是互联网中的______协议，使用______次握手协议建立连接。这种建立连接的方法可以防止______。TCP使用的流量控制协议是______。

A．固定大小的滑动窗口协议
B．可变大小的滑动窗口协议
C．后退N帧ARQ协议
D．选择重发ARQ协议

答案

参考答案：B

单项选择题 A1型题

晚期习惯性流产最多见的原因是（）

A.胚胎发育异常

B.胎盘功能不全

C.染色体异常

D.子宫畸形

E.宫颈内口松弛
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单项选择题

The UNIX operating system is made up of three parts; the kernel, the shell and the programs. The kernel of UNIX is the (71) of the operating system: it allocates time and memory to programs and handles the filestore and communications in response to (72) .
The shell acts as an (73) between the user and the kernel. When a user logs in, the (74) program checks the username and password, and then starts another program called the shell. The shell is a command line (75) (CLI). It interprets the commands the user types in and arranges for them to be carded out. The commands are themselves programs: when they terminate, the shell gives the user another prompt (% on our systems).

A．interconnect

B．index

C．interface

D．interpreter
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