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佺ijô


ߣ  ݽʯԭ  2018-6-26

֪λ佺ʱǷ񾭳ܵijȵţ֪̼˵Ľʵ佺ôߴ磿ô֪佺ʵʳȡΪ˽߶Է佺ijôǣڽʯҽĽ̡

ȣڽ֮ǰҪֵȵһǽĵĸRʾ5˿0.05ףоǷ佺ĸHʾֽൽߵĺȡ9ףֽȦ佺һıߵľ89ĸDʾֵǺܿԻáڽĵǿԲDzԡֳȷdz򵥣ֱóӾͿԲó

ͼƬDzķ

佺

ͼƬDzԲһߵıߵijȵķ

佺ijȲ

ΣֽĵλΪ׵λ0.05׻ΪΪٳ100Ϊ0.05/100=0.0005ס

ý׳ԵȺףٳԳףٳ3.1416=佺ʵʳ ĸʾΪH/R*D*3.1416óľǸýʵʳȡôʵʲֵ9/0.05*0.089*3.1415=50.328.

Ϊҽˣ佺ĵijôϣԶ˽⣬ȡ


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