S1 : How often do you maintain the oily water separatorS2 : We flush filters with steam periodicallyQ:How do they maintain the oily water separator
选项:
A: They flush filters with steam sometimes
B: They usually flush filters with seawater
C: They flush filters with steam at regular intervals
D: They always flush filters with seawater
发布时间:2024-06-06 16:36:01