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问题 选择题

—Mr. White didn’t come last night ,did he?

—No ,we          for him. A whole night was wasted.

A．had waited

B．have been waiting

C．were waiting

D．had been waiting

答案

答案：D

单项选择题

有关力法求解超静定结构的问题，下列说法正确的是( )。

A．(A) 力法基本体系可以足瞬变体系

B．(B) 静定结构可以用力法进行求解

C．(C) 超静定结构可以作为力法的基本体系

D．(D) 结构的超静定次数不一定等于多余联系个数
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单项选择题

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
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