题型:问答题 (10分)下图是某元素及其重要化合物之间的相互转化关系图(生成物中不含该元素的物质均已略去)。其中A是单质,D在常温下呈气态,F可用作氮肥。据此,请回答下列问题:(1)写出物质的化学式:A ,D ,F 。(2)写出下列变化的化学方程式:B→C 。E→C 。 查看答案
题型:选择题 He had _____ homework to do that he had no time to play with us last night. [ ]A. such muchB. so manyC. such manyD. so much 查看答案