Is the standard toilet for rounds in star-rated hotels covered or open?

Because the drain pipe of the toilet is just like the outside, the toilet cover is not covered for a long time, and the odor of the sewer is easily transmitted to the bathroom through the toilet, which will cause the whole bathroom to be full of odor. This is also the reason why hotels build toilets.

Hotel standard for one-star rooms: at least 20 rooms (sets) can be rented. It is well decorated with cushioned beds, tables, chairs, bedside tables and other supporting furniture. At least 75% of the rooms have bathrooms, equipped with buckets, basins, showers or bathtubs and shower curtains. There is a separate bathroom for men and women on the floor, and there is no bathroom in the guest room. The hotel has separate bathrooms for men and women with shower curtains. Take effective anti-skid measures. 24-hour cold water supply, 16h hot water supply. There are shading curtains. Rooms are equipped with hotel service guide, price list and accommodation regulations. Rooms and bathrooms are cleaned/kloc-0 times a day, and sheets and pillowcases are replaced every other day. 16h provides hot and cold drinking water.