機械

е???

?

е???????е?????硣??е????е???????????д????λe硣

?淨

е???淨??Σ

1. ?

?У???С?е????е????

2.

?????????е????е????в?Ч?????????

3.

?е??е???μ?е??????

?棬??ο??

1. ??

е?????е???е??????????????е????е??

2.

е????????????????????е?е????

3.

е????????????е??μ?е???顣

??

е?????????ó??????е?????ее????顣