uoo32771

03.02.2021 01:19 •  Английский язык

1. many metals can be a) melted and reduced b) melting and reducing c) melt and reduce d) melts and reduces 2. surgical instruments high-carbon steel. a) are made of b) are made from c) are made d) made 3. the main properties of glass transparency, viscidity and brittleness. a) is b) are c) was
d) were 4. i think, gas-metal welding is than submerged arc because submerged-arc can be used only with steels. a) effective b) effectively c) more effective d) the most effective 5. look at speedometer! the car extremely fast! a) moves b) moved c) is moving d) move 6. indicators are the lights
that direction of the car. a) shows b) showing c) show d) showed 7. you can see that they piercing dies for punching holes recently. a) uses b) using c) use d) have used 8. he on milling machine when the cutter suddenly broke. a) was working b) work c) worked d) works 9. composite materials are
being used for building of bridges have unique mechanical and physical properties. a) who b) that c) whom d) how 10. ductile materials energy. a) may b) ought to c) can d) must 11. our factory has got that was improved lately. a) a b) an c) a piece d) a piece of 12. the resistance material in the
contact zone depends the hardness of parts and the geometric shape of the contacting surfaces of the parts. a) on b) of c) for d) from 13. i forgot a fan belt in my car. a) change b) to change c) changed d) am changing 14. polyvinyl chloride considers vinyl chloride, concentrated acids and
alkalis and alcohols. a) many b) much c) few d) a lot of 15. polythene consists ethane. a) on b) of c) with d) by