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问题 选择题

有关气体压强,下列说法正确的是（   ）

A．气体分子的平均速率增大，则气体压强一定增大

B．气体分子密度增大，则气体压强一定增大

C．气体分子平均动能增大，气体压强一定增大

D．气体分子平均动能增大，气体压强可能减小

答案

答案：D

气体压强由两个因素共同决定，只知道一个因素变化是无法确定压强的变化的.

选择题

某高速公路弯道处设计为内侧低外侧高的圆弧弯道，使路面与水平面有一倾角，弯道半径为。当汽车在该弯道转弯处沿侧向的摩擦力恰为零时，汽车转弯的速度为（  ）

A．

B．

C．

D．安全速度与汽车的质量有关
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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. Datagrams do arrive may well do so in the wrong order, it is also up to TCP to （） them into messages in the proper sequence.

it is also up to TCP to （） them into messages in the proper sequence.

A．reassemble

B． reduce

C． re-create

D． retransmit
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