【简答题】一陨石在地表上方高为h=4.2×10 3 km的圆形轨道上绕地球运动,它突然与另一质量小得多的小陨石发生正碰,碰后损失掉2%的动能.假定碰撞不改变大陨石的运动方向和质量,试求大陨石在碰撞后最接近地心的距离.地球半径取为R=6.4×10 3 km。
【判断题】理想的减肥节食办法,是快速减掉脂肪而保留身体蛋白质。
【单选题】【单选】A vessel, the passage of which is not to be impeded, _____ to comply with this Rule when the two vessels are approaching one another so as to involve risk of collision.
【单选题】A vessel the passage of which is not to be impeded()to comply with this Rule when the two vessels are approaching one another so as to involve risk of collision.
【单选题】A vessel, the passage of which is not to be impeded, to comply with thus Rule when the two vessels are approaching one another so as to involve risk of collision.
【单选题】A vessel, the passage of which is not to be impeded, to comply with this Rule when the two vessels are approaching one another so as to involve risk of collision.
【简答题】陈胜、吴广:公元前 209年、大泽乡 ( 1)原因:戍守误期(直接);秦的(根本)。 ( 2)口号:且壮士不死既已,死既举大名耳,王侯将相宁有种乎! ( 3)政权:张楚政权 ( 4)结果:失败 ( 5)影响/地位:中国历史上 农民大。