我国发射的“神州六号”载人飞船,与“神州五号”飞船相比,它在更高的轨道上绕地球做匀速圆周运动,如图所示,下列说法中正确的是 A.“神州六
氯化亚铜(CuCl)常用作有机合成工业中的催化剂,在空气中迅速被氧化成绿色;见光则分解,变成褐色。下图是工业上用制作印刷电路的废液(含Fe3+、
Since you have practiced so much in driving, there be any difficulty in passing the road test. A.mustn’t B.shouldn’t C
有人从某地出发,先向南行走3千米,再向东行走3千米,假如再走3千米,此人回到了原来的出发点。回答7~8题。 7.此人的出发点位于( ) A.赤道
56 He is very tall and can be easily___________(spot)in the crowd. 57 To make members of a team perform better, the trainer first of all has to know their____________ (strong) and weaknesses.
If the wild animals wander onto _____ land, the landowner may require the government to get them back. A. deserted B. private C. rough
设{an}为等比数列,a1=1,a2=3. (1)求最小的自然数n,使an≥2007; (2)求和:T2n=