单项选择题

100BASE-TX makes use of two pairs of twisted pair cable, one pair used for transmission and the other for (69) .

A．reception
B．detection
C．relation
D．connection
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单项选择题
A typical peripheral device has (66) which the processor uses to select the device’s internal registers.
A．data
B．a control
C．a signal
D．an address
单项选择题
（1）处应选择（）

A．operating
B．programming
C．security
D．service
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