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问题 操作题

如图，在平面直角坐标系中，△ABC的顶点坐标为A(-2，3)、B(-3，2)、C(-1，1)．

（1）若将△ABC向右平移3个单位长度，再向上平移1个单位长度，请画出平移后的△A1B1C1；

（2）画出△A1B1C1绕原点旋转180。后得到的△A2B2C2；

（3）△A'B'C'与△ABC是位似图形，请写出位似中心的坐标；

（4）顺次连结C、C1、C'、C2，所得到的图形是轴对称图形吗？

答案

（1）（2）如图；

（3）(0, 0)；（4）是轴对称图形

单项选择题

Each machine supporting TCP has a TCP transport entity, either a library procedure, a user process, or part of the kernel. In all case, it manages TCP streams and（）to the IP layer. A TCP（）accepts user data streams from local process, breaks them into pieces not exceeding 64KB, and sends each piece as a separate IP（）. When datagrams containing TCP data arrive at a machine, they are given to the TCP entity, which reconstructs the original byte streams.

The IP layer gives no guarantee that datagrams will be delivered properly, so it is up to TCP to time out and（）them as need be. Datagmms do arrive may well do so in the wrong order, it is also up to TCP to（）them into messages in the proper sequence.

so it is up to TCP to time out and（）them as need be.

A．reassemble

B．reduce

C．re-create

D．retransmit
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单项选择题

已满14周岁不满18周岁的人违反治安管理的，( )处罚。

A．免予

B．从轻

C．从轻或者减轻

D．不予
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