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提取含淀粉较多的天然药物宜用：
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用溶剂法从天然药物中提取化学成分的方法有：
用水提取天然药物时，常不采用：
Freshers' Week bluesYes, it's Freshers' Week, and while everyone else is having the time of their life, you're homesick; there's not a soul you know, you've only made one "friend" and the two of you are clinging together as if you were drowning in heavy seas. It's so bad that you're seriously considering jumping on the next train back home.Sound familiar? Of course it does. Freshers' Week tends to be seen as a weeklong party in which you make lifelong friends, but for many people it can be a bit of an ordeal. So here are some tips about a fresher's two biggest problems.Feeling homesick: Everyone does, but be aware that the feeling will pass as you get used to your new environment and meet people you really get on with. In the meantime, it helps to keep in close contact with your friends and family. But remember that the way you're going to get over feeling homesick is to get out there and meet people-- so don't sit at your computer all day writing email after email to your friends back home. Along the same lines, at the weekends, try not to go home too often. Stay around at uni and you'll meet other people like you, people who want to develop some meaningful relationships.Difficulty making friends: This is something few of us want to admit to, but the truth is that a lot of young people are shy and find it difficult to make friends in an unfamiliar environment with no one they know to support them. If you're feeling unconfident, the beat way to get over it is to join lots of clubs. Once you decide on the ones that interest you and get involved with them, you'll find yourself having fun with people who share your interests -- in other words, friends!
Freshers' Week usually lasts _____________.
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