分期分段开挖
episodic and segmentalized excavation
分期分批割换工艺
the technique of renewing plate by stages
汛期分期
division of flood seasonal phase
flood season staging
flood season segmentation
cause analysis
flood season stage
division of flood seasonal phases
flood seasonality determination
division of flood season
flood stage
segmentation of flood season
divided flood season
初投资偿还期
amortization period of original capital cost