分子外层电子吸收辐射能跃迁到激发态，再通过无辐射弛豫方式转入最低三重态，然后跃迁回到基态各个振动能级，产生光辐射，这种发光现象称为______。
   A．分子磷光；    B．分子荧光；    C．化学发光；  D．生物发光。

A. Because Henry has no time.B. Because someone else decorated the house.C. Because there was no instruments in thehouse. D. Because Henry decorated the house himself. 点击查看答案

A. Around 6 p.m. B. Around 7 p. m.C. Around 8:30 a.m.D. Around 8:30 p. m. Conversation 2 点击查看答案