问题补充:
单选题Justassoundtravelsthroughtheairinwaves,electricitytravelsthroughtheairin______radiowaves.A.what is calledB.which is calledC.what it is calledD.which it is called
答案:
A解析 略
时间:2018-11-16 05:09:55
单选题Justassoundtravelsthroughtheairinwaves,electricitytravelsthroughtheairin______radiowaves.A.what is calledB.which is calledC.what it is calledD.which it is called
A解析 略