【简答题】(绵阳市)瘦肉精是一类对人体健康危害极大的化学物质,政府已严禁在猪饲料中添加瘦肉精。常见的瘦肉精化学式为 C 12 H 18 OCl 2 N 2 ,下列有关这种瘦肉精的说法中正确的是( B ) A .是一种无机化合物 B. 分子中碳、氢、氧三种元素的质量比为 72 : 9 : 8 C. 相对分子质量为 277g D. 由 C12H18O 、 Cl2 、 N2 三种 分子组成
【简答题】I had failed again . It was the day of the big marathon . I had decided three years ago to train for the half-marathon and take home a medal . There I sat, in front of my TV, while I watched oth...
【简答题】Turn the underlined sentence/clause into an-ing/-ed phrase or vice versa. 把下列划线句子改成独立主格结构,或者把独立结构改成从句。 (10 Χ10 ) The machine consists of three parts, each of which has its own motor. When class was ov...