LEO satellite communication system has the properties of larger power dynamic range, larger and faster changed doppler frequency shift and rapid fluctuation compared to ordinary communication system.
Due to the extensive pumping of groundwater, the rangeof phreatic fluctuation was enlarged and the suffosion was enhanced.
大量抽取地下水使地下水位波动的幅度增大，从而潜蚀作用增强。
3
The two laser beam system has been used to measure the relative density of linen dust, with the feature of wide measurement range, good sensitivity and restraining the intensity fluctuation noise.