写出罗马帝国的建立者。
屋大维
Think hard and you won't have the puzzle _____ you. [ ]
A. puzzling
B. puzzle
C. to puzzle
D. puzzled
空气压缩机站设备必须使用闪点不低于（）摄氏度的压缩机油。
A.200
B.215
C.230
