There are usually three main features about the pilot plant test sample:large mass and large grain size of samples, difficulty to control the sample grade.

半工业选矿试样一般有三大特点：质量大、矿岩石样粒度大及控制送样品位难度大。

youdao

"In those cases, if you show the sample to a different pathologist, you often get a different grade," he says.

他说：“在这些情况下，如果你把这些样品展示给不同的病理学家，他们通常会给出不同的分级。”

youdao

The sampling frequency and the sample size can be adjusted according to the effectiveness of the segregation between the adjacent Grade A and B zones.

可根据B 级洁净区对相邻A 级洁净区的影响程度，调整采样频率和采样量。

youdao

Unfortunately, there is currently no exchange-traded fund available by which you can efficiently capture the group effect of owning (or shorting) the full investment grade or speculative grade sample.

FORBES: Use Bond Ratings To Pick Stocks