苯并二氮杂革类药物盐中被置换出的无机酸类，在醋酸介质中的酸性强弱顺序
A. 高氯酸＞氢溴酸＞硫酸＞盐酸＞硝酸
B. 高氯酸＞硫酸＞盐酸＞氢溴酸＞硝酸
C. 硫酸＞盐酸＞氢溴酸＞高氯酸＞硝酸
D. 硫酸＞高氯酸＞氢溴酸＞盐酸＞硝酸
E. 氢溴酸＞硝酸＞硫酸＞盐酸＞高氯酸
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奎宁是一种弱碱，溶剂滴定应选择的溶剂为
A. 纯水
B. 液氨
C. 冰醋酸
D. 甲苯
E. 甲醇
What is always a good way to end the speech？
A. Leave the PPT on to help audience take notes.
B. Keep away from the troublesome Q& A session.
C. Wait until the audience have no more questions.
D. Wind up questions and give the closing statement.
Which of the following statements is INCORRECT about punctuality in delivering speeches？
Always begin to deliver the speech on time.
B. If some audiences are late, repeat the important points.
C. Only mention the key points if time is going to run out.
D. Have a clock at hand to know the ending time clearly.
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