改革开放30多年来，我国经济保持了持续高速增长，已经成为世界经济体系不可或缺的重

种植体植入的时机是拔牙后的（）

A.1月

B.2月

C.3～6月

D.1年以后

E.均可

下列关于浮动抵押的说法正确的有( )。

A．社会团体可以设定浮动抵押

B．设定浮动抵押必须以书面形式

C．不动产也可以设定浮动抵押

D．浮动抵押应向公证机关办理登记

以下关于图片框控件的说法中，错误的是

A．可以通过Print方法在图片框中输出文本

B．清空图片框控件中图形的方法之一是加载一个空图形

C．图片框控件可以作为容器使用

D．用Stretch属性可以自动调整图片框中图形的大小

我国专利法规定，专利申请人对驳回专利申请不服的，可以自收到通知之日起3个月内向哪一机关请求复审？（）

A.国务院专利行政部门

B.专利复审委员会

C.人民法院

D.专利工作管理部门

The TCP protocolis a （1）layer protocol. Each connection connects two TCPs that may be just one physical network apart or located on opposite sides of the globe. In other words, each connection creates a （2） witha length that may be totally different from another path created by another connection. This means that TCP cannot use the same retransmission time for all connections. Selecting a fixed retransnussion time for all connections can result in serious consequences. If the retransmission time does not allow enough time for a （3） to reach the destination and an acknowledgment to reach the source, it can result in retransmission of segments that are still on the way. Conversely, if the retransmission time is longer than necessary for a short path, it may result in delay for the application programs. Even for one single connection, the retransmission time should not be fixed. A connection may be able to send segments and receive （4） faster during nontraffic period than during congested periods. TCP uses the dynamic retransmission time, a transmission time is different for each connection and which may be changed during the same connection. Retransmission time can be made（5） by basing it on the round-trip time (RTT). Several formulas are used for this purpose.

（3）是（）

A.process

B.segment

C.program

D.user