已知A—H均为初中化学常见的物质。其中A、C是组成元素相同的气体,且C能产生温室效应;B为红棕色,是赤铁矿的主要成分;F是紫红色金属;H是蓝色沉淀。根据右图所示的转化关系(图中反应条件均已略去),请回答: (1)写出下列物质的化学式: B 、C ; (2)写出下列反应的化学方程式: ① ; ② ,反应②的基本反应类型是 。
【简答题】根据短文判断正(T)误(F)。 This is my bedroom. The books and dictionaries are in the bookcase. The photo of my family is on the wall. My backpack is on the chair. And I have a baseball. It's on the floor, bet...
【简答题】完型填空。 This is my bedroom. We can see 1 pictures on the wall. The light (灯) is 2 the desk. The football is 3 the chair. 4 is the bed? It is near the desk. My father and 5 bedroom( 卧室 ) is near my room....
【简答题】编程:求 n 个数的和。首先输入一个整数 n ,然后输入 n 个整数,求它们的和。 部分程序如下: #include int main(void) { int number, sum; int i, n; sum = 0; scanf("%d", &n); for(i = 1; i <= n; i++) { scanf("%d", &number); } printf("%d\n", sum); ...