關於Belowisaselectionfro的百科

• Belowisaselectionfromapopularsciencebook.Ifbloodisred，w...

• 問題詳情：Belowisaselectionfromapopularsciencebook.Ifbloodisred，whyareveins(靜脈)blue?Actually，veinsarenotblueataremoreofaclear，yellowishoughbloodlooksredwhenit'soutsidethebody，whenit'ssittinginaveinnearthesurfaceoftheskin，it'smoreofadarkreddishpurplethe...
• 2021-04-1321235