1. What is software maintenance?Software maintenance is the modification（修进） of a software product after delivery to correct faults, to improve performance（性能） or other attributes（特性）, or to adapt the product to a modified environment.2. What is regression testing?Regression testing identifies new faults that may have been introduced as current ones are being corrected. A regression test is applied to a new version or release to verify that it still performs the same functions in the same
