计算机随机选择采样点，采样点车车不同，保证了样品的代表性、公正。

The random sample selection and different sample positions ensure the samples to be representative and fair.

youdao

计算机随机选择采样点，采样点车车不同，保证了样品的代表性、公正。

The random sample selection and different sample positions ensure the samples to be representative and fair.

youdao