在网页制作中，使用扫描仪对照片进行扫描，一般采用( )分辨率的扫描仪。A．150d

消防安全中的“两知、三会”的内容是：知防火常识，知灭火常识；会报火警，会疏散自救，会协助救援。

某探头晶片材料标识为P时，它的材料是锆钛酸铅。

鸿沟是中国最早的沟通黄河和长江的运河。（）

硅沉着病营养治疗原则（）。

A.能量适中、高优质蛋白、高膳食纤维

B.高能量、低蛋白、高膳食纤维

C.高能量、低蛋白、低脂肪

D.高能量、低蛋白、高脂肪

E.低能量、低蛋白、低脂肪

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