试题与答案

2013年12月14日“嫦娥三号”着陆器突破了我国首次实现地外天体上的软着陆,着

题型:问答题

题目:

2013年12月14日“嫦娥三号”着陆器突破了我国首次实现地外天体上的软着陆,着陆前,它从离月面h=4m高处做自由落体运动,并安全的降落在月球表面,已知月球表面的重力加速度为

g
6
,g=10m/s2,求:

(1)着陆器自由落体运动的时间t;

(2)着陆器着陆时的速度大小v0

答案:

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参考答案:本次事故属于一般事故。原因是造成1名工人死亡、3名工人受伤,属于一般事故(3人以下死亡,或者10人以下重伤,或者1000万元以下直接经济损失的事故)。上报程序不正确,应在1小时内向事发地县级以上人...

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Harvard will have a similar arrangement for families making up to $180,000. That makes the price of going to Harvard or Yale (9) to attending a state-run university for middle-and upper-income students. The universities will also not require any student to take out (10) to pay for their (11) , a policy introduced by Princeton in 2001 and by the University of Pennsylvania just after Harvard’s (12) . No applicant who gains admission, officials say, should feel (13) to go elsewhere because he or she can’t afford the fees.

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16()

A.chance

B.model

C.disposition

D.location

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