Опровергните утверждения.he has been to america.the pupil speaks french very well.they have helped the pensioner.the girl watched her favourite tv programme yesterday.
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Ответы на вопрос:
he has never been to america
the pupil doesn’t speak
they haven’t
the girl didn’t
2hgo = 2hg + o2 v(моль) кислорода = 3над кислородом ставится 3, над оксидом ртути х. тогда: х = 2 * 3 /1 = 6 моль.
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