（2012•临沂）晓雯同学在做“探究物质的熔化规律”的实验时，观察到试管内的物质在熔化过程温度保持不变，此时温度指示如图所示，则该物质的熔
天文学家测得银河系中氦的含量约为25%.有关研究表明，宇宙中氦生成的途径有两条:一是在宇宙诞生后2分钟左右生成的；二是在宇宙演化到恒星诞生后
Our eating habits are very important for good health and a strong body. There are times when most of us would rather eat sweets and ice-cream than meat and rice. Sweets and ice-cream are not bad if we
Chairman Mao once said,“It is not hard to do one good deed. It is hard to do good deeds all your life.” Guo Mingyi, a 52-year-old worker in Anshan, Liaoning did just that. Over the past 20 years,
下列关于英法两国政体叙述错误的是 A.英国的国家元首是国王 法国国家元首是总统 B.英国政府首脑是首相 法国政府首脑是总理 C.英国政府首脑是首相
1916年，孙中山先生曾对“宁波帮”企业家作过高度评价：“凡吾国各埠，莫不有甬人事业，即欧洲各国，亦多甬商足迹，其能力之大，固可首屈一指者
There is an endless supply of stories about sleepwalkers （梦游者）．People have been said to climb on roofs, solve mathematical problems, write music, walk through windows, and do murder in the
. 如图，图中正方形ABCD的边长为4，则图中阴影部分的面积为 （ ） 第7题图 （A） 16-4∏ （B）32-8∏ （C）8∏-16 （D）无法确定
