单项选择题 For a L√Opurifier, if the back pressure of the oil outlet is too high, the interface between oil and water in the bowl will （）.

单项选择题 Which of the following influences the position of the interface between the liquid seal and the oil in a purifier?（）

单项选择题 Which of the following is NOT on the list items to be recorded in Oil Record Book Part I (machinery space operation)?（）