El diccionario moderno inglés-ruso de ingeniería mecánica y automatización

• Contains about 15,000 terms related to:
• - metalwork,
• - machine parts,
• - N/C machines,
• - automated machinery,
• - means of communication,
• - optoelectronics, and other fields of mechanical engineering.

principle of reciprocity of work

= Betti theorem

принцип взаимности работ, теорема Бетти