您要查找的是不是：
- method of random proportional sampling 随机比例抽样法
- probability proportional sampling 概率比例抽样法
- stratified proportional sampling 分层比例抽样
- What I need is nothing but a sample. 我需要的不过是一件样品而已。
- The nurse took a sample of my blood for tests. 护士抽了我的血样去化验。
- Airmail revised price list but full range sample within fortnight. 航空寄上订正价格表，全套样品两周内寄出。
- The force moving a body is proportional to the mass of the body. 移动物体的力与该物体的质量成正比。
- His job is to sample products for defects. 他的工作是抽样检查产品的瑕疵。
- He sent me a sample copy of the book. 他寄给我一本样书。
- Payment will be proportional to the amount of work done. 酬金将与工作量成比例。
- He dipped into the bag and brought out a handful of sample wheat. 他把手伸进袋里，取出一把小麦样品。
- A style or individual sample of writing. 笔迹个人的书法笔迹或风格
- Thousands of people have written in to us for a free sample. 现已有数千人给我们来信索要免费样品。
- I have forwarded you by rail the sample you write for. 我已经把您写信索要的样品通过铁路送给您。
- The pay will be proportional to the time put in. 代价要和所花费的时间成比例。
- You must send some sample to the customer before you go abroad. 在你出国之前，应该先寄给客户一些样品。
- proportional sample 比例抽样器
- Strain is proportional to stress. 应变量与应力成正比。
- The distributor look with favor on your sample shipment. 您发来的样货得到了经销商们的赞许。
- Salary is proportional to years of experience. 薪金视资历而定。
