The model overcomes the unpredictability due to monotonicity and periodicalfluctuation of freight volume.
该模型克服了货运量的单调性和周期波动性给预测带来的困难。
2
Periodicalfluctuation in the air influx of column occurs frequently at the adjusting stage during the startup of an air separation unit.
空分设备启动进入调整阶段时，常常会发生进塔空气量周期性波动的现象。
3
Based on statistics of fire in China in the past years, the characteristics of developing trend and periodicalfluctuation are found in fire regularity in China.