Is there free toughbook tablet sample provided?

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What is the ceramic ring in the fish tank made? Get the best water quality by Best biological purification of fresh water and sea water,It is a kind of enhanced filtration material with pure biological properties.Can be used in all biological filters,External filter,A drop purification filtration system and a garden pond filter.As an efficient and durable filter material, it is also particularly suitable for small biological filters,Biological filter cotton can be used as a front filter material to avoid pollution caused by floating objects.Because the ceramic ring is covered with micro-holes,Suitable for the reproduction of nitrobacteria,It can play a role in purifying water quality.Efficient in small filters.Quick action-fresh water or sea water aquarium,Best water quality.Keep fish and plants healthy.Reduce the frequency of water change.Long service life.Does not break down itself,Resistant to seawater corrosion.Available in most filters.The unique pore structure makes it ceramic to settle dow

How to clean the HEPA filter of the vacuum cleaner? 50 First, if damage occurs,The filter screen of the vacuum cleaner can be replaced,You only need to buy the same type of filter,But the filter is mainly about daily cleaning.1. determine that the vacuum cleaner is in a state of mechanical and electrical separation;2. open the dust collection warehouse and gently draw out the air inlet filter screen;3. replace the new air inlet filter or rinse the air inlet filter with clear water;4. put the cleaned air inlet filter screen in a cool and ventilated place;5. remove the air outlet filter from the back of the vacuum cleaner;6. replace the outwind filter or clean the dust on the outwind filter and install it back into place.1. do not use rubbing and rubbing methods when cleaning the filter screen;2. do not use the washing machine to clean the filter screen;3. the vacuum cleaner filter can only be dry, dry or blown or baked by other methods;4. ensure that the filter is installed back to the original pla