C Do you want to make a forceful and impressive public speech and become an eloquent (有口才的) speaker? The newly-published books in our bookstore help you realize your dream.Time waits for nobody.Take action! 20% discount on all the orders above $ 100.Here are introductions of these books. 10Days to More Confldent Public Speaking. ByThe Princeton Language Institute, Lenny Laskowski Paperback: 224 page ISBN: 0446676683 Price: $20 per copy THISbook is a course on g如图是实验室制取和收集气体的常见装置回答下列问题:(1)实验室利用装置B制取气体时,长颈漏斗下端管口应该插入液面下,这是为什么?(2)实验室利用A、E组合,可以制取气体;写出所制取气体的反应方程式;(3)装置C与装置B相比,具有哪些优点?(4)某种气体可以利用装置G(气体由a端进)收集,可推测该气体具有什么性质?