【单选题】【消耗次数：1】
根据流体流动连续性方程，流体在圆管中的流速与（ ）。
①
管道截面积成正比
②
管道截面积平方成反比
③
管径平方成反比
④
管径平方成正比
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液流流经薄壁小孔的流量与 小孔通流面积 的一次方成正比，与 压力差 的1/2次方成正比。通过小孔的流量对 温度 不敏感，因此薄壁小孔常用作可调节流阀。
①
正确
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