我国钨资源矿产丰富。由黑钨矿提取钨发生的反应之一为:3H2+WO3W+3H2O。 其基本反应类型是[ ]
A.化合反应
B.分解反应
C.置换反应
D.复分解反应
答案:C
根据括号内的汉语提示,完成句子。(每空一词)
1. The young man found it difficult to have dinner because some of his _____ (牙齿)had been pulled out.
2. Tom and Linda have been _____ (结婚) for ten years, butthey've never quarreled.
3. If you want to become a good Marathon athlete, you must practice _____ (跑步) every day.
4. He manages over 100 big companies, He is considered to be one of the most _____ (成功的)
business men in China.
5. Their answers to the question were not the same, that's to say, they answered the question
_____ (不同地).
6. When you communicate with your American e-pal on the internet, the e-mails are supposed to
be _____(写) in English.
下列选项中水门汀是()
A.无机非金属修复材料
B.无机金属修复材料
C.有机非金属修复材料
D.有机金属修复材料
E.以上均不是