Период обращения двойной звезды 30. Большая полуось видимой орбиты 4, параллакс-0, 06. Определить сумму масс и массы звезд в отдельности, если они отстоят от центра масс на расстояния, относящихся как 5:7

Слово «ламбрекен» имеет

французское либо голландское

происхождение, это уменьшительное

слово от lamper, veil (бархатная завеса).

Слово портьера происходит от

французского порт - дверь.

Само слово жалюзи произошло от

французского jalousie - "ревность". В

19 веке во Франции были опробованы

и внедрены похожие варианты

сегодняшних жалюзи. Они служили

для сокрытия замужних красавиц

от взглядов прохожих с улицы.

Ревнивые мужья таким образом

удовлетворяли своё желание спрятать

своих возлюбленных от посторонних

наблюдателей.

Most people have hobbies and interests which they prefer doing in their free time. As for me, I don’t get much free time, especially on weekdays. However, at weekends I try to do the activities I like most of all. They are skating, bowling, dancing, swimming, reading, listening to music and going out with my friends. Ice-skating is something that I have taken up recently and I quite enjoy it. Swimming is my all time favourite activity. For bowling and dancing I need a company. Sometimes me and my friends go to the nearest disco and dance there. The ground floor has bowling alleys, so we can combine these two activities. When I have spare time I love reading books, especially romantic novels and detective stories. When I want something relaxing, I listen to music. My favourite band at the moment is Linkin Park. Occasionally I go for a walk with my best friends. We chat about everything, and sometime we even gossip about other classmates. I plan my weekends in advance. If I don’t have my own plans my friends usually offer me something exciting. Speaking of hobbies, I’d like to tell you about my collection of coins. I collect coins from all over the world. My father often travels and he brings me many different coins. My other hobby is collecting soft toys. I already have more than 50 items. They occupy a special place in my room and my heart. I know that British teenagers have many other leisure activities, such as playing football, horse-riding, taking care of pets, going hiking or to theme parks, and else.