结论在人工灌区的引水干渠内，常规药物灭螺在预防人群感染方面可能起一定作用，但对年度钉螺及感染性钉螺螺口消长的作用有限。
Objective To learn the impact of the routine snail control with niclosamide on the population of snails and infected snails in the main channel in the man-made irrigation area.
盘道岭隧洞是引大入秦灌溉工程总干渠上最长的无压引水隧洞。
The Pandaoling tunnel is the longest non-pressure diversion tunnel of the main channel from Datong river to water irrigation project at Qinwangchuan region.
盘道岭隧洞是甘肃引大入秦灌溉工程总干渠上最长的无压引水隧洞。
The Pandaoling tunnel is the longest non-pressure diversion tunnel of the main channel of theDatong River to Qinwangchuan region water transferring irrigation project.
盘道岭隧洞是甘肃引大入秦灌溉工程总干渠上最长的无压引水隧洞。
The Pandaoling tunnel is the longest non-pressure diversion tunnel of the main channel of theDatong River to Qinwangchuan region water transferring irrigation project.
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