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问题 解答题

已知a的绝对值是4，4与c互为相反数，d的倒数是2，求a+24+2c-|d|的值．

答案

∵a的绝对值是0，

∴a=±0，

∵b与c互为相反数，

∴b+c=0，

∵d的倒数是l，

∴d=

z
l
，

当a=0时：a+lb+lc-|d|=0+l（b+c）-

z
l
=0-
z
l
=3
z
l
；

当a=-0时：a+lb+lc-|d|=-0+l（b+c）-

z
l
=-0-
z
l
=-0
z
l
．

单项选择题

（）是岩浆经过地壳运动，沿地壳薄弱地带上升冷却凝结后形成的岩石。

A.岩浆岩

B.沉积岩

C.变质岩

D.石灰岩
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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 (1) to the IP layer. A TCP (2) Accepts user date streams from local process, breaks them into pieces not exceeding 64KB, and sends each piece as a separate IP (3) .When datagrams containing TCP date 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 (4) them as need be. Datagrams do arrive may well do so in the wrong order, it is also up to TCP to (5) them into messages in the proper sequence.

A．dategram

B．stream

C．connection

D．transaction
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