If YOu are selling your house "as is", must you leave the appliances?

No as long as you make it clear from the very beginning that they are not included.
So you should even do that before they even walk through the house and make it clear again before they agree to anything AND have it in anything they sign that should include stuff like that.

Actually all houses are sold as is basically, if after the buyer makes a offer, if he wants a home inspection, you can either accept or deny that

In your offer to sell ( your listing) you say if you are including them or not. In the offer to buy, the buyer will ask for them, or not ask for them.
Most home purchase contracts are very specific on listing these.

As is, is really more of a car purchase term, but in a home sale it can be listed to mean that you are not willing to fix any defects in the home at this time,

Selling a house as-is refers to the fact that the seller will do no repairs on the house and that no guarantees of home condition are made.

It has nothing to do with personal property like appliances. Most of the time a separate personal property agreement is signed, and/or this is a part of the purchase agreement. Having an as-is clause should keep you from having to do repairs to any personal property included as well.

Generall a fridge is considered part of the house. Same with builtins like a stove, dishwasher, etc. Clothes washer and dryer are more likely considered personal property.

But the easiest answer is to have a separate document describing what will be included