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

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V--- ???????

????????????5???

(1)50°????

3.0??=1??

???磺A??B????????12??????6.0????A??B50°???????ж????????????

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51+2

????A??50°53?????ж???B

?????B??A

???????51-2

????B??50°49?????ж???A

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

?????????????????????С?????????????2.0 7.8 5.0????????????3.0????????????????7.8 5.0?????2??????

(2)40°????

????????50°?????????????????????

(3)30°????

????????50°?????????????????

(4)20°????

????????50°?????????????????

(5)10°????

(??)????????????????????????????????????????????????????????????仯???????ж??????????????????Щ???????????????????????????????????????????????????????????????????????????????100°--130°???

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

65°±V L??

65???

???磺A??B????????12??????2.5????A??B?????ж????65°????

???????65°-1 12???????????61??

????A??64°61?????ж???B

???B??A

???????65°+1

????B??66°61?????ж???A

?????????????????????????6.8 2.3

65??????????1°=3??=2.5??

2.3?????????2.5?????

6.8?磬?5.0???硣???????3??=2.5?磬??????0.8???????1????????????????1.8?????0.8??????????2????

????A??63°63?????ж???B

???B??A

????B??67°59?????ж???A

??????????????????????????????????????Щ????????????????????????????????????????

(??)??????????????????????????????????????????????????????????????????????????????????????????????Щ????ù?????????????????????????????????????磺???

????????10°56?? ???????40°82??

????????15°67?? ???????40°72??

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