In recent years, with the continuous improvement of engineering design and scientific research requirements and the rapid development of computer computing capability, numerical mechanical analysis has become a conventional means to solve complex engineering analysis problems. Its main functions are shown in the following aspects （ ）.
A.
To study the internal mechanics mechanism of engineering problems
B.
Increased engineering and product reliability
C.
Identify potential problems during the engineering and product design phases
D.
Increased engineering and product costs