在自动控制系统中,干扰作用是作用于被控对象的()。
A、输入信号
B、输出信号
C、输入物料
D、输出物料
参考答案:A
表示9个2相加的乘法算式是( )或( )。
For each blank,choose the best answer from the four choices and write down on the answer sheet.
(1) is a protocol that a host uses to inform a router when it joins or leaves an Internet multicast group.
(2) is an error detection code that most data communication networks use.
(3) is an interior gateway protocol that uses a distance vector algorithm to propagate routing information.
(4) is a transfer mode in which all types of information are organized into fixed form cells on an asynchronous or non -periodic basis over a range of media.
(5) is an identifier of a web page.
5()
A.HTTP
B.URL
C.HTML
D.TAG