核素自发地蜕变为另一种核素,同时放出各种射线,这种现象称作放射性衰变

1、正确
2、错误
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DearMr./Ms,

Mr.JohnGreen,ourGeneralManager,willbeinParisfromJune2to7andwouldliketocomeandseeyou,say,onJune3at2.00p.m.abouttheopeningofasampleroomthere.Pleaseletusknowifthetimeisconvenientforyou.Ifnot,whattimeyouwouldsuggest.Yoursfaithfully,

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