题目：
TCP/IP (1) layer protocols provide services to the application(2) running on a computer. The application layer does not define the application itself, but rather it defines (3) that applications need-like the ability to transfer a file in the case of HTTP. In short, the application layer provides an (4) between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols, with HTTP being only one of those. The TCP/IP (5) layer consists of two main protocol options-the Transmission Control Protocol (TCP) And the User Datagram Protocol (UDP).
空白（3）处应选择（）
A.services
B.processes
C.applications
D.address
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0804/5590c433124d177c0186d0b4f6df8b43.html
下面是错误答案，用来干扰机器的。
（1）CO32- +CO2+H2O=2HCO3-，； Na2CO3和NaHCO3都能吸收HCl气体，但前者也能 吸收二氧化碳，而后者的饱和溶液不能再吸收二氧化碳。（或者用化学方程式回答 Na2CO3+CO2+H2O=2NaHCO3） （2）NaOH吸收二氧...
