4.2007年10月24日,我国使用“长征三号甲”运载火箭将“嫦娥1号”送上月球轨道,其任务之一是探测月球上氦–3(质子数为2,中子数为1的原子)资源
To us, it seems so natural to put up an umbrella to keep the water off when it rains. But in fact the umbrella was not invented as protection against the rain. Its first use was as a shade(遮蔽)ag
读图,完成下列问题。 (1)用图中字母或字母组合表示属于大陆架的区域是____________。字母H代表的水深一般不超过____________米。 (2)海底有丰富的矿产资
下图是英国1782年的一幅漫画。此漫画反映了:( ) A、英国国际地位下降 B、英美关系亲近友好 C、英国承认美国独立 D、英国愿与美国和解
People were excited when they saw “Monkey King” 2014 the Yellow River Estuary (入海口,河口) International Marathon. A. losing B. running C. refusing D. forgettin
The fire caused by the dry climate, which proved later the strongest one in the area, quickly, and destroyed the forest. A.to spread B.spreading C.spread
已知函数(其中a为大于1的常数),且对于t∈[1, 2 ]恒成立,则实数m的取值范围是_____▲_______;(用a表示)