单选题A feedback is an input（）A which governs the state of a variableB which provides a visual and audible alarmC which indicates values of controlled variablesD which measures the state of the controlled variable

读数据文件的操作可以通过下列 ______ 语句来实现。

A．Input#和Get#

B．Read和Line Input#

C．Get#和Line Input#

D．Line Input# 和Input#

从磁盘顺序文件中读取一整行的信息，通常使用()。

A.Line Input#函数

B.Input Line#语句

C.Input Line#函数

D.Line Input#语句

A.b=nf.parse（input）；

B.b=nf.format（input）；

C.b=nf.equals（input）；

D.b=nf.parseObject（input）；

A feedback is an input ____

A.which governs the state of a variable

B.which provides a visual and audible alarm

C.which indicates values of controlled variables

D.which measures the state of the controlled variable

A.<input type="password"></input>

B.<input type="radio"></input>

C.<input type="hidden"></input>

D.<input type="reset"></input>

使用Do While循环从打开的文件中逐条读取记录。以下能够正确读取数据的程序段是

A．Open "c:\File1．txt" For Input As #1 Do While Not EOF() Line Input #1， strLine Loop

B．Open "c:\File1．txt" For Input As#1 Do While Not EOF(#1) Line Input #1， strLine Loop

C．FileNo=FreeFile Open FileNo For Input As #1 Do While Not EOF(FileNo) Line Input #1， strLine Loop

D．FileNo=FreeFile Open FileNo For Input As #1 DoWhile Not EOF(#FileNo) Line Input #1， strLine Loop