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【简答题】
简述机会成本和经济成本的含义。
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反馈参考答案：
举一反三
【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。
【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.
A.
remains fully obliged
B.
has no obligation
C.
is not likely
D.
is exempted
【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.
A.
remains fully obliged
B.
has no obligation
C.
is not necessarily
D.
is exempted
【简答题】边形建模方式是什么?
【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.
A.
has no obligation
B.
is not likely
C.
is exempted
D.
remains fully obliged
【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.
A.
remains fully obliged
B.
has no obligation
C.
is not likely
D.
is exempted
【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。
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