📄 模拟考试10.htm
字号:
<INPUT class=radio name=text1956 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.不能采用这种连接方式<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>42 </TD>
<TD align=left height=212 width=607> 当计算机需要通过相连的 MORDEM
发送数据时，依次设置的信号是__(50)__。©) <BR>答： <INPUT class=radio name=text1957
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.MODEM就绪→
DTE就绪→请求发送→允许发送→发数据→清请求发送→清允许发送→清MODEM就绪→清DTE就绪<BR>
<INPUT class=radio name=text1957 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.MODEM就绪→DTE就绪→请求发送→允许发送→发数据→清请求发送→清允许发送→清DTE就绪→清MODEM就绪<BR>
<INPUT class=radio name=text1957
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.DTE就绪→MODEM就绪→请求发送→允许发送→发数据→清请求发送→清允许发送→清MODEM就绪→清DTE就绪<BR>
<INPUT class=radio name=text1957
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.DTE就绪→MODEM就绪→请求发送→允许发送→发数据→清请求发送→清允许发送→清DTE就绪→清MODEM就绪<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>43 </TD>
<TD align=left height=212 width=607> 当进行 VP 交换时，VPI 和 VCI
的变化情况是__(53)__。©) <BR>答： <INPUT class=radio name=text1960
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.VPI变化，VCI不变<BR> <INPUT class=radio
name=text1960 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.VPI不变，VCI变化<BR> <INPUT class=radio
name=text1960 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.VPI变化，VCI变化<BR> <INPUT class=radio
name=text1960 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.VPI不变，VCI不变<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>44 </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>45 </TD>
<TD align=left height=212 width=607> 设某编码体制的编码方法为：输入数据、( m =
1,2,… )，发送时，首先计算 bm = (aM+bm-1 ) MOD 2，发送的编码为 Cm =
bm-bm-1。收到的编码为Cm，其译码方法可表示为___(5)___。©) <BR>答： <INPUT class=radio
name=text1971 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.
C+Cm-1<BR> <INPUT class=radio name=text1971
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.Cm-Cm-1<BR> <INPUT class=radio name=text1971
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=C>C.
Cm MOD 2<BR> <INPUT class=radio name=text1971
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.(Cm-Cm-1)MoD 2<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>46 </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>47 </TD>
<TD align=left height=212 width=607> 信元交换采用___(8)___技术进行复用。©)
<BR>答： <INPUT class=radio name=text1974
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.TDM<BR> <INPUT class=radio name=text1974
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.FDM<BR> <INPUT class=radio name=text1974
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.WDM<BR> <INPUT class=radio name=text1974
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.ATDM<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>48 </TD>
<TD align=left height=212 width=607> 计算机向 MODEM 发送的信号后MODEM
随后向计算机发送清除___(14)___信号作为应答。 ©) <BR>答： <INPUT class=radio
name=text1980 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.
'DTE就绪'<BR> <INPUT class=radio name=text1980
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.'请求发送'<BR> <INPUT class=radio name=text1980
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.'MODEM就绪'<BR> <INPUT class=radio
name=text1980 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=D>D.
'允许发送'<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>49 </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>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)，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>51 </TD>
<TD align=left height=212 width=607> 对一路信号进行 FSK
调制时信号到达接收端后通过___(18)___分离各路信号。 ©) <BR>答： <INPUT class=radio
name=text1984 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.解调器<BR> <INPUT class=radio name=text1984
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.带通滤波器<BR> <INPUT class=radio name=text1984
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.载波发生器<BR> <INPUT class=radio name=text1984
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.终端软件<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>
网络协议是计算机网络和分布系统中互相通信的___(21)___间交换信息时必须遵守的规则的集合。©) <BR>答： <INPUT
class=radio name=text1987 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.相邻层实体<BR> <INPUT class=radio name=text1987
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.同等层实体<BR> <INPUT class=radio name=text1987
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