二倍体狂犬疫苗好吗:英语智力题

来源:百度文库 编辑:高校问答 时间:2024/05/05 11:15:43
Without a sound I speak,I am small,light and fast.I express others' thought,abd travel without feet.Who am I?

letter

optic signals

brain wave

e-mail...

信letter

voice (声音)

激光怎么会有声音捏》?