What beam is lighter than all the other beams?还要回答

What beam is lighter than all the other beams?还要回答 英语智力题:What is lighter than a feather,byt you can't hold it for about 10 minutes? My brother is lighter than (i) 英语翻译It is assumed that the isolator is locally reacting having no lateral coupling.The pressure distribution p(x) applied to the receiver beam is simply what would be applied if the receiver beam were immobile 分振幅双光束干涉条纹与多光束干涉条纹的强度分布有什么不同what is the difference in intensity contribution between amplitude-splitting multi-beam fringes and double -beam fringes?why? 英语翻译Is the truth another lie?Is life always what it seems?全文是这样的？Does the sky really cry?Does the sun really beam?Is the truth another lie?Is life always what it seems? That box is lighter than this bag的同义句 My bag is lighter than him哪错了 The big ball is lighter than the small one. That box is lighter than me.哪里有错 What is a feather,but you can't hold it for about 10 minutes?Why?What is lighter than a feather,but you can't hold it for about 10 minutes?Why? This chair is lighter than that one（中文）This chair is lighter than that one（中文） lighter是什么意思 lighter 英文 What can you put in a wood box that will make it lighter?意思. Tara is lighter than Tina同义句（Tina is ( ) ( ) than Tara.) who's school bag is lighter?A.Helen's B.Li Ling is beam led