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一、化学成分 荧光增白剂AT和荧光增白剂162的化学成分有所不同。荧光增白剂AT主要成分是二苯乙烯类化合物,其分子结构中含有苯环和双键,能够吸收紫外光并发出蓝光或紫光。而荧光增白剂162则属于另一类化合物,其确切成分可能因生产商和具体产品而异,但通常也包含能够吸收...
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Building an Ecosystem at the Source", the exhibition attracted nearly 300 exhibitors, drew large crowds, facilitated significant transactions, and achieved impressive results.
经过了一周的角逐和选拔,2022闪耀新声歌手大赛初赛已经落下了帷幕。你有没有欣赏歌手们的歌喉呢~ 10.25～11.1期间,我们共收到了300余名新声歌手的投稿,并且每一首都经过了大学生艺术团声乐部评委们的认真欣赏和慎重选拔。疫情使我...
---May I look at the menu for a little while? ---Of course ___ sir. A.don't worry B.it doesn't matter C.enjoy yourself D.take your time
___ you work hard at learning English you'll be sure to make great progress. A. As far as B. As long as C. So far as D. As well as
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中学英语必考核心重点单词-at 谷雨单词王 2021-09-19 00:00 ,时长09:55视频来源:互联网,本公众号旨在公益分享,旨在方便学生学习,若侵犯您的权益,请留言告知,本公众号将立即删除~