. , . . . . 400 , 2 (150~200), 2 (150), 40 , 4 , 2~3 , , , - 1 , . , - 20~30 . . , 2 4 . . t=170~200°C 20 - . . . . , . , . , . . . , . . / , .
" "! ..., - ...!!!!