vacuumatic pressure gauge for ammonia

例句：

1. 1.The vacuum cleaner is designed to remove dust and dirt from the floor.
   真空吸尘器设计用来从地板上吸走灰尘和污垢。
2. 2.The vacuum-type pump is used for cleaning oily surfaces.
   这种真空泵用于清洁油腻的表面。
3. 3.Vacuum-type filters are commonly used in air purifiers.
   真空型过滤器常用于空气净化器中。