Protozoa were detected in floor drains, standing water on the floor, soiled bars of cutting tables, plastic pallets and out-of-use hot water knife sanitizers.

Method Selecting the wild earthnut of Radix stephaniae tetrandra S, cutting them into bars or bits on the basis of diameter, then planting them by manual work into different plots at different time.

The demolishing process can be divided into three stages: forming cutting slot to expose the reinforcing bars, destability damaging of the exposed bars and fracturing of bearing section.