Given: Length of two trains are 121 m and 99 m running in opposite directions Speed of 1st train is 40 km/h  Speed of 2nd train is 32 km/...

好事成“兔”《中国电视报》诚邀著名画家李燕先生给本报读者送来新春祝福“兔年”说兔李燕　　时间过得真快，癸卯春节到了。有记载于秦代把“地支纪年”的卯位封给了兔，所以今年是“兔年”。比秦早两千年，在彝族、哈尼...

Supernovas are some of the brightest events in the universe, occasionally outshining entire galaxies at their peak. Many supernovas can be seen from b...

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Analysis of data collected from pig farms may be useful to understand factors affecting pig health and productive performance. However, obtaining thes...

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　　中新网8月21日电(记者 宫宏宇)距离与美国总统特朗普“决裂”和宣布成立“美国党”仅不到两月，欧博abg特斯拉CEO马斯克又“反悔”了。 　　《华尔街日报》8月19日援引知情人士消息报道称，马斯克正悄悄暂缓组建新政党的计划，并向盟友表示希望把注意力放在旗下企业。  &nb...

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