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2016ɾɫԣĶ

2016-09-24 14:54:48| й
2016ɾв⿼Եϵ֣μʡдʡԾ񣬸ʡص㡣ϵĶȥʹѶ

һĿͬɫ

ϵ51015ⲻȣѧ֡ʡɽʡ˶רƾ5ѧ㣬רƿ15ѧ㣬㽭510ѧ㣬רƿ10ѧ㡣

ĿѶ

ÿԾϵһĿ120ϣĴﵽ160ϣȥĿҲֻ2~3120ϣɴĶԼӴ󣬽Ѷȡ

2Ŀ

ĿڼĹгָʽСЩ϶࣬ԸӣʹüѶȶӡ

Ŀʵ϶

ϵƿ5ĿһԾ4εĿʵϣĦתͣλĿ

ijΪ˽ͣ⣬ͼʾһγ55׵·οбʽͣλÿλΪ6ס2.6׵ľΣεĿ·߳30°ǣ·Իٸͣλ?(ȡ

 

≈1.7)

 

A.16 B.17 C.18 D.19

Դ磬йѼ

𰸡B

йһռ2.6×

 

≈2.21ףڶռ2.6÷

 

≈2.95ףռͬڶ……6×

 

=3׿հף(55-2.21-3)÷2.95≈16.9˹16+1=17λ

ϴ𰸽йѼԼĴ𰸼˳Ͽ뿼г룬鿼ڿʱοѡ

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