个人股东亲自出席年度股东大会的,应当出示()。
A.本人身份证
B.持股凭证
C.本人身份证和持股凭证
D.书面委托书
参考答案:C
—______ did you become interested in playing chess?
—______ I was still a little boy, ______ the age of five years old, I began to learn it. [ ]
A. While, When, at
B. When, When, on
C. When, When, at
D. When, While, on
简述双生命周期中的领域工程阶段的主要任务及内容。