单项选择题 Grease the roller bearings with HPgun In the sentence “HP” means （）.

单项选择题 The remaining oil/water mixture now flows down into the fine separating compartment and moves slowly between the（） in the Turbulo separator.

单项选择题 The oil （） in the discharging water from oil water separator exceeds 15 PPM without alarm, because the coil was burnt out.