Предмет: Химия, автор: Weyn

Вес 80г. 15п. 160 г на раствор. была добавлена ​​вода. Найдите массовую долю растворенного вещества в полученном растворе. (5шт.)

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Автор ответа: jnona
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решение во вложении                                                                                                                                                                                

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1. She ... this book lately.
1) read 2) has read 3) reads 4) is reading
2. Nobody ... about it (now).
1) know 2) knew 3) knows 4) known
3. Who ... part in the conference today?
1) take 2) have taken 3) took 4) has taken
4.1 shall give her the book, when she...
1) comes 2) will come 3) came 4) has come
5. He ... three letters to her since November.
1) wrote 2) has written 3) is writing 4) writes
6. Does Mr. N.... English newspapers at this book-stall?
1) buys 2) buy 3) buying 4) bought
7. Did she ... there by train?
1 )go 2) goes 3) went 4) gone
8. There ... a scheme and a few diagrams here.
1) are 2) were 3) is 4) have been
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