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long2003
2 năm trước
Tính cường độ dòng điện qua đèn ống, biết rằng cứ mỗi phút có 24.1019 ion+ đồng thời có 24.1019 ion– và electron về đến các điện cực.
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.Fill in each numbered blank with one suitable word. In 2006, Facebook became available (1)_______________ anyone 13 years old and up. It caught on very quickly (2)_______________ over the world, especially among teenagers. Whenever they (3)____________ online, they took the time to post comments on their lives and to check messages (4)____________ friends. They also (5)_______________ photos and visited their friends’ Facebook pages in order to get updates. (6)______________, Facebook and similar social networking sites may be losing popularity among teens. Only 25% of teen in a 2013 study in the US kept in touch daily with others (7)_____________ these sites. And a small study in Australia, nearly one-third of teens questioned did not have (8)________________ on any social networking sites. Even Facebook owns 2014 business report containing (9)__________________ about less teen interest in the site. It looks like Facebook and other social networking sites have to (10)______________ a problem: how to keep teens interested!

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