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發表於:2021-08-25
問題詳情: 若元素A的半衰期為4天,元素B的半衰期為5天,則相同質量的A和B,經過20天后,剩下的質量之比mA:mBA.1:21 B2:1. ...
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發表於:2018-05-06
LiketheGreenMamba,theCopperheadisequippedwiththenewinternalhydro-drivepedallingsystem.TheBlackMambaisthemostdeadlysnakeintheworld.SituateddinLimpopoProvince,SouthAfrica,t...
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發表於:2018-09-12
Theblackmambahasnospecialconservationstatus.Sheputablackmambainhiscamper.Theblackmambaisadeadlypoisonoussnakes,whydoItakethisname?BecauseIonceenteredthestadium,I'mdeadly...