365体育|365体育直播

图片

???????λ????б??? > ??????????????? > ????

??????????????????

2021-01-02 11:24:51.0 ???α?????????

1????????

1.1??Χ????

?溣?????????????????????????λ?????????????????????25???溣??????????????????????????,????113??8??57?壬??γ29??25??41?塣???????????????????????50m????????4.2m????????????0.4m?????????1.98m??????????1.5cm????????????2.5mλ???????100??140cm?????????,??????????λ???????60??60cm????????????

???????????????棬?????64m???????????????18m???????????14.5m??????????31.5m????????????10m?????????Χ??????????????81m????????????????Χ??????????????????120m?????????????????????????????????Χ?????????????????????????????????1-1  ?????沼??????????

1.2????

???????????????

???????          R=420cm

????????          r=340cm

???????        B=40cm

????????          R=198cm

?????????          r=150cm

????????        B=24cm

??????          H=50m

 20210102101031.jpg

?1-1   ?????沼??????

2????????????

2.1??????

2.1.1  ?????????

???????????????????????λ???????溣??????????????????????????????????????????????

2.2 ?????п????

?????п???Χ?????54%?????????Σ????????????????????????????????2-1?????п???????????????

 20210102101242.jpg

?2-1?????п???????????

?????п??????=R?С?54%=4.2??3.14??54%=7.125  ?7.0m

?????п??????=R?С?40%=5.278m   ?5.2m

?????п????=4B=4??40cm=1.6m     ?1.6m

3????????????????????

3.1 ??????????

??С??????W=1/2B=1/2??40cm=20cm

??  ??  ??a=(1??2)W=20??1.5=30cm  ?a=30cm

??  ??  ??b=(0.8????)a=1.0??30cm=30cm  ?b=30cm

??      ??????=38-40mm

??      ??L=65%B=26.0   ?L=26cm

?????????n=?????п???????a-1=520cm??30cm-1??16??

??????m=?????п????b+1=160cm??30cm+1??6??

??????N=n??m=16??6=96??

???????q?1.5kg/m3(?????)

????????Q=abqB=0.30??0.30??1.5??0.40=54.0g/??

?Q=60g/??

??????????Q=N??Q=60??96=5.76kg

3.2  ??????

????????????п?????????????????????????е?????????????????????????????????8???????о??30cm????????6???????30cm??

4????????

?????÷?絼????????????磬???????????????????????????????????????????10??20?????????????????????ù????????????????????????й?????????????????????????????硣

??????M5????????????????M2?????????????M2????????????磨???3??????????????????????

 20210102101243.jpg

?3   ??????????????????

5???????

5.1???????

???????裬?????????????????????λ??????ó??????????????鶨???Χ?????????????γ?????????????????????????

5.2??????

???????????????????????????????????????????????б????

 


-->