璐村惂鐢ㄦ埛_007ZteK馃惥
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急救，有两道高一物理题请大家帮忙解一解！ １人造卫星在轨道上绕地球做匀速圆周运动，如沿跟其速度相反方向抛一个物体，则Ａ 物体可能竖直落回地球，卫星仍在原轨道运动Ｂ 物体与卫星都可能沿轨道运动Ｃ 物体和卫星都不可能沿轨道运动Ｄ 卫星的轨道半径将减小２ 在小河上有一座小木桥，一演员携带两个演出用的铁球，其总重力正好略大于小桥的最大负荷量，为了能一次完成过桥，有人提议让演员像演出一样，将两球抛起并保证任何时刻至多只有一个小球在手中，这样一边抛球一边过河，问这样他能否安全过去，为什么？
各位帮帮忙，这里有几道题，我不会啊！ 1 He's got himself into a dangerous situation _ he is likely to lose control over the plane.a:where b:which c:while d;why2 It is good _ for _students to say hello to teachers when we meet.a:manners,our b:manners us c:customs us d:ways; our3 What she has in mind is beyond _.No one can tell what she will do next.A:imagination b:control c:description d:belief4 With the size of the whole earth, the biggest ocean does not seem big at all.a:compare B:when comparing c: comparing d:when compared5 When did you _ basketball? -last year.a:take on b: take up c: take in d: take off 6 I can thind of many cases _ students obviously knew a lot of English words and expresstions but couldn't write a good essay.a:why b:which c:as d:where
[测试〕看看璇迷们的IQ有多高 http://60cm.com/ad/2005%5F3%5F18/本人测得为１３６，还行
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