如果人的头颅直径为20cm,具有衍射作用的声音频率为
更新时间:2024-04-27 17:45:43 A、频率大于2500Hz的声音D
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颁布世界上第一部社会主义新闻法的国家是()
新闻事业最终形成的标志
“YouaskmeforJulia,andyoudonotpossessevenananna!(Heretheold”—rogue______broadly,asifhehadmadeacapitalpun.)
Shouldyourprice______reasonable,wewillplaceanorder______you.
Toaworker,________fromthepointofviewofsocietyisnecessarylaborisfromhisownpointofviewvoluntaryplay.