Составьте и запишите предложения, в которых слова к стастью, известно, по наблюдениям, далее выступали бы как вводные и как члены предложения.

Для измерения постоянной Планка катод вакуумного фотоэлемента освещается монохраматическим светос с длиной волны 620нм. При увеличении длины волны на 25процентов значение запирающегонапряжения необходимоуменьшить на 0,4В. Определите по этим данным постоянную Планка.

СОЧИНЕНИЕ-РАССУЖДЕНИЕ "Почему Я хочу быть лидером". ПОМОГИТЕ ПОЖАЛУЙСТА!

VII. Put the following into direct speech, using a dialogue form.
Tom: Would you like to come for a drive tomorrow, Ann?
Ann: I'd love to etc.
TRIP TO STRATFORD
1. Tom invited Ann to come for a drive the following day.
2. Ann accepted with pleasure and asked where he was
thinking of going.
3. He said he'd leave it to her.
4. She suggested Stratford... adding that she hadn't been there
for ages.
5. Tom agreed and said that they might go on the river if it was
a fine day.
6. Ann wondered what was on at the Royal Shakespeare Theatre.
7. Tom said they'd find out when they got there... adding that it
was usually possible to get seats on the day of the play.
8. He asked Ann if she could be ready by ten.
9. Ann said with regret that she couldn't as she had to type a report first.
10. Tom expressed horror at the idea of working on Saturday...
and advised her to change her job.
11. She told him not to be ridiculous and explained that ... she
had volunteered to type the report in return for a free afternoon the
following week.
12. She pointed out that she hadn't known that he was going to
ask her out.
13. Tom said he supposed it was all right but ... warned her not
to make a habit of volunteering for weekend work.
14. Ann promised not to.
15. Tom said gloomily that he supposed she'd be busy all morning.
16. Ann assured him that she'd be finished by 11.00 and... offered to meet him at the bus stop at Hyde Park Corner.
17. Tom said that it wasn't a very good meeting place and that
he'd call for her.

Помогите,по химии: кислота HFeO+NaOH=...