- 問題詳情:以下比較中正確的是A.微粒半徑:O2-<F-<Na+<Li+B.電負*:Li<Na<K<RbC.分子中的鍵角:CH4>H2O>CO2D.共價鍵的鍵能:C—C>C—Si>Si—Si【回答】D知識點:化學鍵題型:選擇題...
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- 問題詳情:下列關於鹼金屬的敍述中正確的是()A.K能從LiCl的溶液中置換出LiB.隨着原子序數的遞增,單質與水反應的劇烈程度減弱C.隨着原子序數的遞增,單質熔點逐漸降低D.Cs2CO3受熱易分解【回答】C【詳解】A.鉀是活潑金屬,在溶液中先和水發生反應,K不能從LiCl的溶液中置換出Li,故A錯誤;B.同...
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- 1、IvotedLibDem.2、ThisisnottheproportionalrepresentationofLibDemdreams.3、LotsoferstwhileLibDemvotersare"notveryrational",regretsaseniorMP.4、ButheknowsthatmanyLibDemactivistsareinstinctivelyopposedtocollaborationwiththeTories.5、SomeLibDemsufferi...
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- Shewilleverbeassociatedwiththewomen'slib.I'mnotadvocatingthatwesacrificeourselvesonthealtarofbravadoandwomen'slibbutisn'tittimetogivetheblamebackwhereitbelongs?Inthespringof1972,TIMEdevotedaspecialissueofthemagazinetoassessingthestatusofwomeninth...
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