题目内容
甲苯中的甲基是邻对位定位基，然而三氟甲基苯中的三氟甲基是间位定位基，请解释。
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在室温下，甲苯与浓硫酸作用，生成约95%的邻和对甲苯磺酸的混合物。但在150~200 °C较长时间反应，则生成间位(主要产物)和对位的混合物。试解释之(提示:间甲苯磺酸是最稳定的异构体)。
下列哪个反应是不可逆的（ ）
Complete the dialogue by arranging the given sentences in the right places.C: Good morning!P: 1.______________________________C: Yes, passport, please.P: 2. ___________________________C: Sure. 3._____________________________P: Two bags to check in. One carry-on .C: OK. 4. ____________________________P: All right. 5.___________________________C: 30kgs for check -in. 5kgs for carry-on.C: Here is your boarding pass and baggage check, have a good flight.
2.6 进阶-完成对话-中译英Dialogue 1C： Good morning. 1. ______________________________， please(请出示您的机票和身份证。）P: Here you are.C: 2.____________________________________________(请您把您的行李放到秤上。）P : Is that within the free allowance?C:Yes.P: By the way, can I take this laptop as my hand baggage?C: That's all right. .3 _______________________________ （请问您需要什么样的座位。）P: Window seat.C: I'm sorry. 4. ______________________________ (靠窗的座位已满了。）Will the aisle seat be all right?P: It's OK.C: Your ticket and ID Card, and 5.________________________________________(这是您的登机牌和行李牌。）
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