Based on the new phenomena of the shrinkage of river channels in North China, analyses of the basic principles and some key problems for dredging under shrinking conditions are presented.
本文结合近些年来我国北方河流出现的河床枯萎现象，分析了枯萎疏浚的基本原理及几个关键技术问题，对于目前在黄河等枯萎河道上采用疏浚防洪有一定的参考价值。
The medicine has the functions of promoting blood circulation of heart and brain, improving myocardial ischemia and insufficient blood supply to brain, and dredging the channels and collaterals;
本发明药物具有促进心脑血液循环，改善心肌缺血，脑供血不足，舒通经络之功能；
The medicine has the functions of promoting blood circulation of heart and brain, improving myocardial ischemia and insufficient blood supply to brain, and dredging the channels and collaterals;
本发明药物具有促进心脑血液循环，改善心肌缺血，脑供血不足，舒通经络之功能；
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