RFID中负载调制技术不包括()。
A. 电容负载调制
B. 电阻负载调制
C. 电感负载调制
RFID系统中决定整个系统的工作频率和工作距离是( )。
A. 读写器
B. 电子标签
C. 上位机
D. 接口
Logistics is sometimes described as achieving the “5R” theory, they are right quantity, quality, place, time and ( ).
A. volume
B. location
C. price
D. methods
The word “logistics” was first used in ( ) field.
A. military
B. business
C. industrial
D. commercial