Check the acidity of the soil with a test kit.

用试验具土壤的酸度。

A dentist sterilises his instruments.

牙科医给他的具消毒。

It focuses on the flash tank devolatilizer which is most widely employed in industry.This type of devolatilizer is simple structure,low cost and high productivity.

重点讨论了塔式薄膜蒸发型脱挥，该类脱挥具有结构简单、本低、处理量大等优点。