The experiment results indicted that there existed fairly good linearity between the grain sizes and longitudinal wave velocities when the measurements were done with 5p14z probe.
实验结果表明，用5 P 14 Z探头测得的纵波声速与晶粒尺寸之间有很好的线性关系。
2
GJ89 type probe traps were used to monitor stored grain insects species, distribution in different storage periods in the steel silo.