题目：
为了测量石油管道的流量，安装文丘里流量计，管道直径d1=200mm，流量计喉管直径d2=100mm，石油密度ρ=850kg/m3，流量计流量系数
=0.95.现测得水银压差计读数hp=150mm。问此时管中流量Q多大？
答案：
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参考答案：E
为了测量石油管道的流量，安装文丘里流量计，管道直径d1=200mm，流量计喉管直径d
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