以下说法正确的是( ) A.物质所含元素化合价升高的反应叫还原反应 B.在氧化还 发布时间:2017-04-15 21:41 │ 来源:www.tikuol.com 题型:问答题 问题: 以下说法正确的是( )A.物质所含元素化合价升高的反应叫还原反应B.在氧化还原反应中,失去电子的元素化合价降低C.还原剂中一定有元素被氧化D.物质中某元素失去电子,则此物质是氧化剂
题型:问答题 用所给词的正确形式补全对话。is fly help whose houseLi Hai: It's windy, Dad. It's a good day to fly kites.Father: Yes, it is. Oh, look! 1 is that yellow kite? Li Hai: It's Pingping's. Father: Pingping's kite is 2 very high. Li Hai: Oh, no, no! Her kite is falling down. It's on the 3 now. Father: Have we got a ladder (梯子)? Li Hai: Yes, there 4 one over there. Father: Good. Let's go and 5 her get the kite down. 1._____ 2._____ 3._____ 4._____ 5._____ 查看答案