在△ABC中,角A,B,C的对边分别为a,b,c, 若a=2,b=m,∠A=π4, 若△ABC有两解,则m的范围是( )
elephant, America, it, play, eat
There is a big zoo in our city. In the zoo you can see many animals. Look! There is a big ____monkey there. Next to the monkey, there are two ____They are from Africa. They like____in the water. Look! That is a panda. It is two years old. It is from Sichuan, China. It ____bamboo and other plants. There is also a tiger in the zoo. ____favourite food is meat.
在有“科学奥斯卡”之称的美国《科学》杂志2003年度世界科技大突破评选中,物理学中的“证明宇宙是由暗物质和暗能量‘主宰’”的观点名列榜首,成为当今科技突破中的头号热点.世界科技的发展显示,暗物质、暗能量正成为天体物理学研究的重点.宇宙的暗物质是不能直接观测到的东西,存在的依据来自于螺旋转的星系和星团,这些星系和星团以自身为中心高速旋转而没有分散开去,仅靠自身质量产生的引力远不足以把它们集合在一起的,一定存在暗物质,它的吸引力足以把这些旋转的星系牢牢抓住,根据对某一双星系统的光学测量确定该双星系统中每一个星体的质量都是M,两者相距L(L远大于星体的直径),它们正围绕两者连线的中点做圆周运动.
— _________ my dictionary? I can't find it anywhere.
— I ________ it on the shelf when I came in.