【多选题】When you deliver a farewell sppech, you should mention the following person______.
【单选题】When you deliver your speech, you may prepare in the following ways EXCEPT __________.
A.
Speaking extemporaneously
【判断题】_____ 7. The writer liked economics a little better than botany.
【判断题】沙瑞特试剂是三氧化铬与吡啶在盐酸溶液中形成的络合盐,简称PCC氧化剂,PCC氧化剂溶于二氯甲烷,使用方便。在室温下可以将伯醇氧化成醛,不再进一步氧化,并且不影响碳碳双键、碳氮双键等。
【单选题】锯割管子和薄板工件,必须用 ( ) 锯条。
【判断题】The Athenians paid little attention to military training.