【简答题】Read the letter and choose the best answer. Dear Mr. Sun, It is a great pleasure to send you my sincere congratulations on the 60 th anniversary of Phoenix Trading Company. We consider it our good for...
【简答题】H3PO4, H2PO4-, and HPO42- are acids, and their conjugate bases are H2PO4-,HPO42-,and PO43-, respectively. what are the relationship between Ka of conjugate acid and Kb of its conjugate base?
【简答题】D Recently there was a major discovery in the scientific research — the mapping of all DNA in a human gene( 基因 ) is complete. Couple of years ago, this seems an impossible task for scientist to accomp...