多项选择题
A. near-end crosstalk(NEXT)
B. middle open-end crosstalk(MOEXT)
C. power sum near-end crosstalk(PSNEXT)
D. jitterry crosstalk(JEXT)
E. far end crosstalk(FEXT)
单项选择题 Assuming you build networks to exact specifications, what is the recommended maximum length a 10BaseT cable can be before it has to be segmented or repeated?（）
单项选择题 What is the maximum data rate specified by the IEEE 802.11B standard for wireless LANS?（）
单项选择题 Which IEEE standard is used to define Wi-Fi?（）