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问题 填空题
从方框内选择适当的单词并用其正确形式完成句子（每词只能选用一次）。
start,  parent,  rain,  be,  play
1. Wang Hao is one of the best table tennis   ___     in the world.
2. "You should finish your summer holiday homework a week before school      ____ ," Mum said.  
3. At the      ___    meeting, the teacher told Tom’s mother that Tom had made great progress in every
subject.
4. My parents and I will stay at home if it    ____    tomorrow.
5. Sally   ___      (be) at Park School since she was eleven years old.
答案

1. players  2. starts  3. parents  4. rains  5. has been  

填空题

数控机床的主要组成部件有输入输出设备、（）、（）、机床本体、（）、PLC等。
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单项选择题

A transport layer protocol has several responsibilities, One is to create a process-to-process (program-to-program) communication; TCP uses port (11) to accomplish this. Another responsibility of a transport layer protocol is to create a (12) and error-control mechanism at the transport level．TCP uses a sliding (13) protocol to achieve flow control．It uses the acknowledgment packet，time-out，and retransmission to achieve (14) control．The transport layer is also responsible for providing a connection mechanism for the application program．The application program sends (15) 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．packet

B．time

C．error

D．phase
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