炉衬永久层的主要作用是()。
A.对炉壳钢板起保护作用
B.缓冲工作层受热膨胀时对炉壳的挤压作用
C.承受因温度的激剧变化产生的热应力和其它外力的作用
参考答案:A
2008年8月8日,世人瞩目的第 届 在中国北京隆重举行,中国代表团共获得 金牌,居金牌榜 。
A.29 夏季奥运会 51 第一
B.28 夏季奥运会 51 第一
C.29 残疾人奥运会 88 第二
D.28 残疾人奥运会 88 第一
TCP/IP () layer protocols provide services to the application () running on a computer. The application layer does not define the application itself, but rather it defines () that applications need—like the ability to transfer a file in the case of HTTP. In short, the application layer provides an () 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 () layer consists of two main protocol options—the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).
to the application () running on a computer.
A.hardware
B.software
C.packet
D.equipment