📄 模拟考试9.htm
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default.html 为目录下默认文档的指令是__(59)__©) <BR>答： <INPUT class=radio
name=text1966 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.IndexOptions<BR> <INPUT class=radio
name=text1966 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.DirectoryIndex<BR> <INPUT class=radio
name=text1966 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.DirectoryDefault<BR> <INPUT class=radio
name=text1966 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.Indexlgnore<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>42 </TD>
<TD align=left height=212 width=607>
如果允许以“http://www.xxx.edu.cn/~username”方式访问用户的个人主页，必须通过__(60)__指令设置个人主页文档所在的目录。©)
<BR>答： <INPUT class=radio name=text1967
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.VirtualHost<BR> <INPUT class=radio
name=text1967 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.VirtualDiretory<BR> <INPUT class=radio
name=text1967 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.UserHome<BR> <INPUT class=radio
name=text1967 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.Userdir<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>43 </TD>
<TD align=left height=212 width=607>
为了在广域网上高速传输数字信号，一般可用的编码方式是___(3)___©) <BR>答： <INPUT class=radio
name=text1970 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.
NRZ<BR> <INPUT class=radio name=text1970
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.AMI<BR> <INPUT class=radio name=text1970
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.曼彻斯特<BR> <INPUT class=radio name=text1970
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.8B/10B<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>44 </TD>
<TD align=left height=212 width=607> 信元是信元交换的单位。为控制差错，在信元中包括
CRC 校验和，其生成公式为 ___(6)___©) <BR>答： <INPUT class=radio name=text1972
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.x8＋x7＋x＋1<BR> <INPUT class=radio
name=text1972 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.x8＋x2＋x＋1<BR> <INPUT class=radio
name=text1972 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.x16＋x12＋x＋1<BR> <INPUT class=radio
name=text1972 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.x16＋x15＋x2＋1<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>45 </TD>
<TD align=left height=212 width=607> 元是信元交换的单位。为控制差错，在信元中包括
CRC 校验和，校验和对___(7)___进行校验。 ©) <BR>答： <INPUT class=radio
name=text1973 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.整个信元<BR> <INPUT class=radio name=text1973
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.信元头<BR> <INPUT class=radio name=text1973
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.信元载荷(用户数据)<BR> <INPUT class=radio
name=text1973 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.信元的地址域<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>46 </TD>
<TD align=left height=212 width=607> 信元交换在交换过程中，当实施 VP 交换时，其中
VPl、VCI 的变化情况是___(9)___。 ©) <BR>答： <INPUT class=radio name=text1975
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.
VPI、VCI都不变<BR> <INPUT class=radio name=text1975
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.VPI、VCI根据需要变化<BR> <INPUT class=radio
name=text1975 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.VPI不变、VCI根据需要变化<BR> <INPUT class=radio
name=text1975 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.VCI不变、VPI根据需要变化<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>47 </TD>
<TD align=left height=212 width=607>
信元交换过程中出现拥塞，该信息被记录在信元的___(10)___中。 ©) <BR>答： <INPUT class=radio
name=text1976 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.
GPC<BR> <INPUT class=radio name=text1976
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=B>B.
VPI<BR> <INPUT class=radio name=text1976
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.CLP <BR> <INPUT class=radio name=text1976
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.PT<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>48 </TD>
<TD align=left height=212 width=607> RS-232 是 DTE 和 DCE
之间的接口标准，当作为 DCE 的 MODEM 和作为 DTE 的计算机相连时，按此标准需要连接的最少线数是___(11)___。©) <BR>答：
<INPUT class=radio name=text1977 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.3<BR> <INPUT class=radio name=text1977
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.9<BR> <INPUT class=radio name=text1977
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.15<BR> <INPUT class=radio name=text1977
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.25<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>49 </TD>
<TD align=left height=212 width=607> 当使用 RS-232
通信时，通常需要使用速率匹配功能，完成该功能的协议是___(15)___。©) <BR>答： <INPUT class=radio
name=text1981 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.TELNET<BR> <INPUT class=radio name=text1981
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=B>B.
XON/XOFF<BR> <INPUT class=radio name=text1981
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.KERMIT<BR> <INPUT class=radio name=text1981
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.XMODEM<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>50 </TD>
<TD align=left height=212 width=607> 对一路信号进行 FSK 调制时，若载波频率为
fc , 调制后的信号频率分别为 f1 和 f2 (f1<F2)，则三者的关系是___(16)___。©) <br> 答：
<INPUT class=radio name=text1982 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.fc-f1=f2-fc<BR> <INPUT class=radio
name=text1982 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.f2-f1 = fc<BR> <INPUT class=radio
name=text1982 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.f2+f1 = fc<BR> <INPUT class=radio
name=text1982 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.f1*f2 = fc<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>51 </TD>
<TD align=left height=212 width=607> 对一路信号进行 FSK 调制时，若载波频率为
fc , 调制后的信号频率分别为 f1 和 f2 (f1<F2)，当对多路信号进行调制时，调制后各信号的频谱___(17)___。 <br
©)> 答： <INPUT class=radio name=text1983
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.相同<BR> <INPUT class=radio name=text1983
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.部分重叠<BR> <INPUT class=radio name=text1983
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.连续<BR> <INPUT class=radio name=text1983
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.不重叠且不连续<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>52 </TD>
<TD align=left height=212 width=607> WDM 与 FDM 工作方式相似， WDM
调制的是___(19)___。©) <BR>答： <INPUT class=radio name=text1985
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.时间<BR> <INPUT class=radio name=text1985
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.频率<BR> <INPUT class=radio name=text1985
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.波长<BR> <INPUT class=radio name=text1985
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.相位<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>53 </TD>
<TD align=left height=212 width=607> WDM 与 FDM 工作方式相似，ILD
是___(20)___使用的设备。 ©) <BR>答： <INPUT class=radio name=text1986
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.TDM<BR> <INPUT class=radio name=text1986
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.FDM<BR> <INPUT class=radio name=text1986
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.WDM<BR> <INPUT class=radio name=text1986
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.ARDM<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>54 </TD>
<TD align=left height=212 width=607>
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