题干

在植物有效成分的提取过程中,常用萃取法、蒸馏法和压榨法,错误的是

A:蒸馏法的实验原理是利用水将芳香油溶解下来,再把水蒸发掉,剩余的就是芳香油

B:压榨法的实验原理是通过机械加压,压榨出果皮中的芳香油

C:萃取法的实验原理是使芳香油溶解在有机溶剂中,蒸发掉溶剂后就可获得芳香油

D:蒸馏法适用于提取玫瑰油、薄荷油等挥发性强的芳香油

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答案(点此获取答案解析)

A

同类题3

根据短文内容和所给中文提示,在空白处写出单词的正确形式。每空限填一词。

Life as Chopsticks

Right now, more and more people are digging into their food with ____ (二) sticks which are called chopsticks. Even people eating with knives and ____ (餐叉) begin to love them. What’s so special about them? Because they have deep influence in many people’s ways of life.

Simplicity. There's____ (几乎不) anything simpler than chopsticks. With new technology developing every day, there is ____   (仍然) something that has just one use —simply to eat. Also the chopsticks don't ____ (花费) much. In real life, we don’t need to keep improving things all the time.

 Aim. When using chopsticks,you can not pick up everything in one go. Know what you want and just do it. Sometimes, a little bit of focus makes the difference ____ (在…之间) failure and success.

 Practice. Using chopsticks doesn’t come naturally. You have to learn to use them and practice it. Most would ____ (同意) that there’s no better way than to practice. In real life, you may have many things you want to do, but it will just be a ____ (梦想) if you don’t try doing it.

 Slowing down. A healthy way to eat is to eat with chopsticks. It slows you down and it ____ (允许) your stomach to tell your brain you are full before you overeat. In our life, we sometimes need slow down to have time to think, to realize that we’re actually full and don’t have to rush full ____(速度) through life.