第8题: [单项选择]下列荷载中，属于偶然荷载的是（）。 A. 预加应力 B. 混凝土收缩 C. 撞击力 D. 基础沉降 参考答案:C 答案解析:本题涉及的考点是偶然作用（偶然荷栽、特殊荷载）。在设计基准期内可能出现，也可能不出现，而一旦出现，其值很大，且持续时间较短。例如，爆炸力、撞击力、雪崩、严重腐蚀、地震、台风等。
参考答案:
Dec. 21st, 2008 Dear Manager, I am writing to complain about the SQ200 cell phone I bought last week in your shop--the First Department Store. I guess that something has gone wrong with the information system of the phone. I cannot send or receive any messages with it. Neither can I take any photos even though the users’ guide says that I can do so. I really feel upset about it. Could you please change another one for me or send me the refund Enclosed please find the receipt. I am returning post. Your early reply will be well appreciated. Yours sincerely, Wang Hua
答案解析:
[写作指导] 本文为投诉信．投诉信为正式商业信函的一种，应符合书信的基本格式，包括：日期、称呼、正文，客套结束语和署名等。要特别注意在投诉信里交待清楚所要投诉的问题及提出解决办法．另外在语气上要
第21题: [单项选择]What do we know from the conversation A. The woman and the man are taking different classes. B. The woman and the man are going to the same class. C. The man is learning Japanese. 参考答案:A 答案解析:[解析] W: I am going to the Japanese class. Will you come along M: No, I’ m going to the Engli
