单项选择题 Which IEEE standard is used to define Wi-Fi?（）

单项选择题 Which of the following data network would you implement if you wanted a wireless network that had a relatively high data rate, but was limited to very short distances?（）

多项选择题 When you compare the differences between half-duplex and full-duplex Ethernet,which of the following characteristics are exclusive to half-duplex?（）