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当前学科:第五章工程总体设计
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灌溉渠道或排水沟的级别应根据灌溉流量或排水流量的大小确定,当灌溉流量为300~100m
3
/s,排水流量为200~50m
3
/s时,灌排渠沟工程的级别为()级。
A . 1
B . 2
C . 3
D . 4
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