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一轻弹簧在60N的拉力下伸长30cm，现把质量为4kg的物体悬挂在该弹簧的下端并使之静止，再把物体向下拉10cm，然后由静止释放并开始计时。求： (1) 此小物体是停在振动物体上面还是离开它? (2) 如果使放在振动物体上的小物体与振动物体分离,则振幅A需满足何条件?二者在何位置开始分离?
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【简答题】The cylinder head is usually cast in one piece from iron, from iron alloyed with other metals, or from aluminum alloy. Aluminum has the advantage of combining lightness with high heat conductivity .th...
【单选题】En décembre 2018, la Chine compte combien d'internautes mobiles selon le recensement?
A.
82 851 000.
B.
816 980 000.
C.
828 510 000.
D.
Le chiffre n'est pas mentionné.
【单选题】The situation in Haiti after the earthquake was all in a mess, ______ the increasing number of robbery cases.
A.
causing
B.
having caused
C.
caused
D.
to cause
【简答题】On a fondé la Chine en 1949.
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