对不具备归档条件或保存价值的文电，经鉴别并报办公室主任批准后，必须由三名以上人员参加，可销毁处理。
参考答案：错
-How come your father can read books in German?
-Well, he _______ on a project with some German engineers for 3 years when he was young. [ ]
A. worked
B. has worked
C. had worked
D. would work
把两个相等的半圆拼成一个圆，那么这两个半圆的周长之和等于这个圆的周长______．
