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испытания в тяжёлых условиях stresses
archit.	heavy-duty test; heavy-duty testing
Makarov.	heavy duty test
metrol.	heavy-duty tests
oil	severe-duty test
qual.cont.	rigid test; severe test
испытание в тяжёлых условиях
auto.	rigid test; severe test
O&G, sakh.	heavy duty test
oil	heavy duty test (andrushin)
tech.	heavy-duty test
transp.	severe duty test

испытание в тяжёлых условиях: 10 phrases in 6 subjects

Automobiles	4
Energy industry	1
Forestry	2
Mechanic engineering	1
Oil and gas	1
Transport	1