Generally, when lighting and ventilation fans are installed in the bathroom of the family, they need

The application in reality should be C, two switches to control the lamp and exhaust fan respectively, which one to turn on which, to open two at the same time.

Test question analysis: The analysis of the question requires that the lamp and the fan do not affect each other and can work independently, so the lamp and the fan should be connected in parallel, and they should "work independently", indicating that their respective branches have a switch control, and there is no switch on the trunk road, so choose D

From the perspective of efficacy, it is not necessary, but it seems to be more accustomed to having a ceiling light visually.

As long as it is connected, there is no damage and pollution. For example, the use of structural adhesive connection, although there is no damage to the wall, but after demolition, there will be structural adhesive bonded to the wall. If this is allowed, use structural adhesive for bonding. I hope my answer can help you.

The range of bath bomb lighting is not ideal, and a mirror-like headlamp in the bathroom is still very necessary.