What are the steps of writing an apology letter（）
A. Give your apology at the beginning of the letter
B. Apologize again or give thanks for understanding
C. State the problem and give explanation for what happened
D. Arrange for a future action to make up
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This story happened on____（）
A. 21st of October, 2009
B. 2009, Oct.21st
C. Oct. 21st, 2009
D. 2009, 21 October
关于轴向拉压杆斜截面上的正应力和切应力，错误的表述有（）
A. 正应力和切应力不可能同时达到最大值；B:正应力达到最大值时切应力为零
B. C．切应力在45º的斜截面上达到最大值，在–45º的斜截面上达到最小值
C. D．正应力和切应力不可能同时为零
D. E．正应力为其最大值的一半的截面上，切应力达到最大值
E. F．正应力为其最大值的一半的截面上，切应力在数值上与正应力相等
In preparation phase, Which of the following information is not collected by negotiators（）
A. The legal system
B. Objectives
C. Bargaining ranges
D. Population
If your prices are competitive, we are confident______ the goods in great quantities in this market.（）
A. To sell
B. to be selling
C. in being sold
D. in selling
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