电子商业汇票清偿，必须记载下列事项（）
A.追索人名称及签章
B.清偿人名称及签章
C.同意清偿金额
D.清偿日期
参考答案：A, B, C, D
Which of the following statements about sampling errors is FALSE（）
A. Sampling errors are errors due to the wrong sample being selected from the population.
B. Sampling error is the difference between a sample statistic and its corresponding population parameter.
C. Sampling errors will vary from one sample to the next.
（）是对软件产品、过程、资源等使用历史资料或经验公式等进行预测。
A.测量
B.度量
C.估算
D.指标
