普通净毛率
参考答案：
指经过洗毛以后所得的净毛重量占该毛样原毛重量的百分比。
用所给词的正确形式填空。
1. They work out the difficult maths problem all by _____ (oneself) today.
2. What would you do if you _____ (win) a scholarship?
3. If it _____ (be) nice today, we _____ (go) for a picnic. But we were unlucky today.
4. If I _____ (have) time, I could play with you.
5. If you had got up earlier, you would _____ (catch) the train.
