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67.

:

1) , , ;

2) , . . ;

3) , . . ;

4) , . . .

. X , X ( ) - X . - , . . . , - - , . , :

- . .

1. -. ,

. , , , :

(67.2)

,

2. , , (67.1), X , , , (67.1)

(67.4) , .

, , , -, ,

, , (67.5) , (67.5)

(67.4), X

. 67.1

3. X (67.4), (. 67.1):

(67.4) (67.7), :

, :

, .

, (

(67.4)

, X X X (67.10)

,

(67.11) (67.12) , ,

,

. . , (67.9) (67.13),

, 7, , , . .

4. . ,

, :

(67.16) (67.10) (67.15),

,

, ,

:

(67.6) , .

, , . , , , .

(. )

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