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水在直管中流动，现保持流量不变，增大管径，则流速（）。
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水在直管中流动，现保持流量不变，增大管径，则流速（）。
A、增大
B、减小
C、不变
D、无法判断
时间：2022-06-13 14:30
关键词：
化工原理
化学工程
大学试题
工学
答案解析
B
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