Tại sao Danh bạ không được đặt đồng đều trên thẻ SD?

As you can see below, some of the contacts seem to be longer than the others. Also, in the SD card section (second row from the top) the last contact (#8) seems to be thinner and closer to the seventh contact. Why not have all the contacts be the same size and place them at uniform distances from each other?

The power and ground contacts stick out farther so that power is applied or removed, before or after, the data contacts are connected or disconnected.

The eighth and ninth contacts were added to the MMC format when making the full-sized SD format. There was not room for eight full-sized contacts (maintaining backward compatibility) and perhaps they learned a thing or two about applying and removing power first between the implementation of the MMC and SD formats (or about making it cheaper without an extra switch if they extended the contacts).