下列选项，哪项中含有保护期限，受到时间限制的知识产权？（）
A.商标权
B.著作权
C.外观设计专利
D.发明专利权
参考答案：A, C, D
All the task ____ ahead of time, they decided to go on holiday for a week. [ ]
A. had been finished
B. were finished
C. having been finished
D. been finished
塞尺（又称测微法）是用来测量（）。
A.薄片厚度的
B.孔深的
C.锯割深度的
D.零件配合表面间隙的
