. Масса мраморной плиты равна 120 кг. Какую силу нужно приложить,
чтобы удержать ее на некотором постоянном уровне под водой?


1)1610 Н;       2)1200 Н;       3)
760 Н;        4) 600 Н.

поставьте глагол to be в необходимую форму

1. I ... a student. 2. He.. an economist. 3. We.. workers. 4. They ... doctors. 5. You..a manager. 6. She... a secretary. 7. It ... a cat. 8. These girls ... very strange. Where  ... they from? 9. I ... fond of sports 10. Jane... married, but  Nick and John... single 11. You and Kate ... here for the first time 12. We ... at the lesson now 13. He ... a businessman and his wife ... a model 14. They ... my friends, but who ... he? 15. Where ... your car? 16. I ... an artist , and what ... you? 17. Here ... all my money 18. Helen ... Russian. She ... 19. She ... She ... a good student. She ... not married. She ... single  Her eyes ... green. She ... beautiful.