In construction, the raft foundation is laid first with the cushion layer, and then the base plate is made. Isn't that the same as the reinforced concrete strip foundation?

The construction process is the same: first lay the cushion, then tie the steel bars, then set up the formwork, and then pour the concrete.

As you said, the bottom plate of the raft foundation is a whole,

But the reinforced concrete strip foundation, so it is clear that the strip is a foundation form one by one. When the upper part of the building is wall-bearing, the foundation is set along the wall, usually in a long strip shape. This is called a strip foundation or a strip foundation, which is the basic form of wall-supported building foundation.

There is another point to note: there is no "reinforced concrete strip foundation bottom plate" for the strip foundation. There is at most a cushion layer underneath it.

Hope this helps! !