用“maintenance free”造句大全，maintenance free造句

The inserting pin with fixed structure which does not need oiling is pollution free and maintenance free.

High precision dynamic balancing machine has the characteristics of low noise, high efficiency, long service life, and fully enclosed in high performance grease, life-long maintenance free.

We provide door-to-door delivery installation debugging and one-year maintenance free of charge and all-life services.

The press has been designed as a maintenance free product. All the load points use special non-lubricated bearings.