常用的苫盖方法主要有几种？
参考答案：
简易苫盖法、鱼鳞式苫盖法、棚架式苫盖法
I was surprised to know that ________ two top students were caught stealing in the supermarket.
Worse still, ________ third one was found fighting with others. [ ]
A. the; a
B. the; the
C. /; a
D. /; the
某人测得一本字典正文400页厚度为18.0mm，则该字典正文每张纸厚度为_____mm。
