The tags,the size of a grain of rice,use the power from a radio pulse emitted by an electronic reader to send out a code which can be picked up.
The tags,the size of a grain of rice,use the power from a radio pulse emitted by an electronic reader to send out a code which can be picked up.
这种仪器，有米粒大小，以电子雷达发射的无线脉冲供能——可以向外界发射无线电信号。