Does step recovery diode has short recovery time?

It depends on the type of diode (of which there are many, such as LEDs, zener, rectifying, etc). Diode datasheets can usually be found for given diode numbers that can be found engraved or marked on...

I think ,reverse recovery time is the time at which diode change itself from conduction state to nonconduction state.

One through seven. However, remember that willingness and belief in the process are the most important part of the steps. It is not necessary to believe in a religious kind of god.

This can vary depending on the severity and possible complications; however, it takes about 8 to 12 weeks from injury to recovery.

an easy way i learned was to put your arms behind your head and the sorts your muscles out and slows your breathhing rate down after a long run =)