单项选择题
Which of the following tools would be the BEST to check connectivity of a CAT5 cable？（）
A.Tone generator B.Multimeter C.Punch-down tool D.Cable tester
单项选择题 WhichofthefollowingInternetconnectiontypeshasthehighestamountoflatency？（）
单项选择题 WhichofthefollowingcabletypesistheLEASTaffectedbyEMI？（）
单项选择题 WhichofthefollowingdevicessetstheframingtypeonaT1circuit？（）
