????:1?????????:??????????

2??????150???

3????????100???

4????????

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

??10??!????????:????????????????

??,???«?????????»?????,??????????2??18??????20?????,«????????2»????????1??????????????????8????

2??????18????????,????????,???????????10???“?????????2”!??????:“«????????2»??????22?????????????,??????????,??”

???????,???????????cos(??)?:?“????????”,?“????????????”,???????

???cos??????,????????:????cos??

??,?????????????????????,?????????:“??????????,????????,???,??????????”

???????????,??“????”,???????????????«??»???;??????“??????”,?????«??????????????????????????»??????,????

???,???,“???????“?”??????!”“????????????????!”“?,??????????”

«????????????????????????????2»???

22??

?:?????????!???????!

??2??????????????18????,«?»??,??2????19?????????2???22????????????,???

??????(2?????????????????????18?),«???????»??????,???,?????????“??”??????????????????????,2??????????22????,????????????????8??,«??»?(????)?123.2??

??????????????,??????,«?????????????»??????,??,??:“?,????,??????,?????????”

???????????,??«??»??????,?????????«??????»??,?“?????????”?????????

“?'?????«????????»'??,???”??????????,??,????

????????????????????????????????,????????????????,???????:“????,??????????”???

??????/???????????:???????????????????

(???????????)

???:?????