销毁秘密载体，应当（）
A、履行清点手续
B、经本单位主管领导批准
C、履行登记手续
D、确保信息无法还原
参考答案：A, B, C, D
将下列句子用另外的方法表达，但意思不变。
1. This is a TV. → It a chair. It is a TV.
2. This is my pencil. → This pencil is .
3. That is your ruler. → .
4. My hands are clean. → My hands are .
5. They are playing loudly. → They are not playing .
在工程项目管理组织中，从事和完成具体任务的阶层是（）。
A．决策层
B．协调层
C．执行层
D．操作层
