积极型和消极型投资管理在（）方面都存在不同表现。 A.投资组合的构造 B.交易 C.

2010年6月18日以来，我国大蒜价格又现涨势。截至7月4日，全国大蒜价格累计涨幅已超过7％。表中材料反映了2010年大蒜价格变动的多方面经济关系，请概括材料体现的经济生活道理。

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某研究性学习小组探究影响导体电阻大小的实验．

（1）要验证导体电阻与导体长度有关，应选择如图中的线 _________ ；（填序号，下同）

（2）要验证导体电阻与导体横截面积有关，应选择图中的线 _________ ；

（3）要验证导体电阻与导体材料有关，应选择图中的线 _________ ；

（4）本实验采用了物理学科探究常用的 _________ 法．

程序设计语言的基本成分是数据成分、运算成分、控制成分和( )。

A．对象成分

B．变量成分

C．语句成分

D．传输成分

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.

（2）是（）

A.path

B.window

C.response

D.process

文学接受与文学欣赏或文学鉴赏（）。

A、是同一个概念

B、不是同一个概念

C、前者以读者为中心

D、后者以作品为中心

E、共同以读者和作品为中心