光诱导的电子转移（photoinduced electron transfer，PET）是指激发态电子从电子供体到电子受体的转移现象，光致激发态是发生电子转移（ELT）的起因，故有光诱导电子转移之称。 这是一 …

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比如PET对应的是雅思4-4.5分左右，和BEC preliminary剑桥商务英语初级语言能力相当。 另外，剑桥通用英语五级考试（MSE）本身是严格按照欧洲委员会制定的语言教学大纲进行设计 …

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Jan 27, 2024 · Before buying an exotic animal as a pet, ask yourself what exactly you're looking for. Are you looking for a companion, a friend, someone to play with? These animals vary …

在七个标志中，可作为水杯或饮料包装使用的有： 1号（PET）：矿泉水瓶、汽水瓶等。 70度以上易变形，所以不能用来装热水，也不能放在汽车内晒太阳。 另外，1号瓶反复使用10个月之 …

Oct 14, 2025 · Small Mammals, such as Mice, Hamsters, and Rats are great for kids and first time pet owners. They're also wonderful to keep in classrooms for young children to learn how to …

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通常情况下，PET材料比PP材料更坚固、耐用和耐热。 如果需要制作比较耐用的产品，比如瓶子、罐子等，PET材料可能更适合。 另外，PET材料也比PP材料更透明，在制作透明或半透明 …