ߣ ݽʯԭ 2018-6-26
֪λ佺ʱǷܵijȵţ֪̼˵Ľʵ佺ôߴ磿ô֪佺ʵʳȡΪ˽߶Է佺ijôǣڽʯҽĽ̡
ȣڽ֮ǰҪֵȵһǽĵĸRʾ5˿0.05ףоǷ佺ĸHʾֽൽߵĺȡ9ףֽȦ佺һıߵľ89ĸDʾֵǺܿԻáڽĵǿԲDzԡֳȷdzֱóӾͿԲó
ͼƬDzķ
ͼƬDzԲһߵıߵijȵķ
ΣֽĵλΪλ0.05ΪΪٳ100Ϊ0.05/100=0.0005ס
ý׳ԵȺףٳԳףٳ3.1416=佺ʵʳ ĸʾΪH/R*D*3.1416óľǸýʵʳȡôʵʲֵ9/0.05*0.089*3.1415=50.328.
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