Предмет: Химия, автор: nimfadura

имеется руда массой 5кг, содержащая 70% Fe2o3. найдите массу углерода, необходимого для полного восстановления металла из этой порции руды!!! очень срочно!!!

Ответы

Автор ответа: yurikam

2

Ответ:

вроде так должно быть, но это не точно

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Choose the correct answer (a, b, c or d)

1. When ... back from your business trip?

a) did you come

b) you have come

c) have you come

d) you came

2. Nice to see you! I ... you for ages.

a) didn't see

b) don't see

c) haven't seen

d) can't see

3. How many new schools ... this year?

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b) have built

c) built

d) have been built

4. The play ... several times in the last century.

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b) staged

c) has been staged

d) has staged

5. I can't read this. I ... my glasses.

a) forgot

b) have been forgotten

c) forget

d) have forgotten

6. I... Ann yesterday. Perhaps, she's ill.

a) hasn't seen

b) don't see

c) haven't seen

d) didn't see

7. ... any tomatoes? I can't see them in the bag.

a) you have bought

b) have you bought

c) you bought

d) did you buy

8. The teacher... out test papers. Let's go and find out the results.

a) has marked

b) marked

c) has been marked

d) marks

9. Application forms that... cannot be accepted.

a) didn't sign

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