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天津快乐十分开奖直播

不适合 WatchKnowLearn
年龄: 8 - 18
22465 观看人次:
WatchKnowLearn.org : Brief Overview
源自 WatchKnow,制作人 Dr. Walt Henley
Brief overview of this free website, WatchKnowLearn.org.? WatchKnowLearn is a super-directory of over 50,000 free educational video links that are organized by subject matter. (02:58)
October 20, 2016 at 06:30 PM
不适合 WatchKnowLearn
年龄: 8 - 18
23 观看人次:
The people, history and culture of Uzbekistan - Traveling the Silk Road | DW Documentary
源自 YouTube,制作人 DW Public Broadcasting
With its magical buildings, fascinating landscapes and friendly people, Uzbekistan has a lot to offer. It is a country caught between rich traditions and mod...
发现人:whenley,于 Middle East Geography
October 20, 2018 at 12:16 AM
不适合 WatchKnowLearn
年龄: 14 - 18
3218 观看人次:
The Economics of Choosing the Right Career
源自 YouTube,制作人 Marginal Revolution University
As many who entered the labor market following the Great Recession know all too well, graduating with a college degree does not mean you’ll easily fall into a good career. Four-year college graduates with entry-level jobs actually earned more in 2000... [更多]
发现人:MRUniversity,于 Career Paths
August 7, 2017 at 03:30 PM
不适合 WatchKnowLearn
年龄: 13 - 18
6216 观看人次:
The Respiratory System : Trachea and Bronchi (16:04)
源自 YouTube,制作人 mrfordsclass
This video continues our look at the Respiratory System, with the trachea and the bronchi.??This is Lesson 4 in our Respiratory System series. This is part of our Anatomy and Physiology lecture series.?(06:23)
October 6, 2014 at 09:32 AM
不适合 WatchKnowLearn
年龄: 5 - 18
2784 观看人次:
How Earth's Tilt Causes Seasons - Khan Academy
源自 YouTube,制作人 Sal Khan
In this video, Mr. Khan focuses on how the Earth's tilt causes seasons.?Sal Khan of Khan Academy uses computer software with images for demonstration. (20:17)
July 15, 2011 at 02:03 PM
不适合 WatchKnowLearn
年龄: 10 - 18
35 观看人次:
United Nations Day (October 24th) - Facts
源自 YouTube,制作人 Occence Media
20 Facts About facts United Nations Day (United Nations Day 2018). The United Nations is an international organization founded in 1945 to maintain international peace and promote human rights. (05:53)
October 17, 2018 at 04:08 PM
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