有个别不法厂家为防止食物油变质，在其中加入一种叫BHA抗氧化剂，但它却是一种致癌物．BHA的化学式为C9H12O，它是由______种元素构成，每个分子总共含______个原子，其相对分子质量为______．
由C9H12O可知，BHA是由碳元素、氢元素和氧元素等3种元素组成，每个分子总共含22个原子，其相对分子质量为：12×9+1×12+16×1=136．故填：3；22；136．
| 补全对话。 | |
| A: Good morning, Miss. 1__________. B: I'd like to buy a yellow dress. Do you have any yellow dresses? A: yes. 2__________ B: I would like size "S" A: here you are. B: 3__________. A: Sure, Is it all right. B: Yes, it fits well, I like it very much, 4__________. A: ￥:280 B: OK. 5__________. Here is the money. A: Thank you. Good-bye, sir. B: Bye.
|