根据不通的签名过程，多重数字签名方案可分两类：即（）和（）。
参考答案：有序多重数字签名；广播多重数字签名
医德规范的具体表现形式应除外的是（）
A.宣言
B.誓词
C.法典
D.守则
E.法规
根据下列句子的意思及所给的汉语提示，写出空缺处单词、固定短语或固定搭配的正确
形式。
1. I'll show my collection of ______ (邮票) to the class.
2. We practiced ______ (唱) English songs for one and a half hours today.
3. Which country is ______ (大) in population, the US or Canada?
4. Xu Li, with his friends, ______ (拾起) waste paper in the park every Sunday.
5. Do you know this table ______ (由……制成) bamboo?
