D1: ?
A1:
,
D2: ?
A2: ,.SEP 1921-84 e/e,D/d,C/c.
D3: ?
A3: S50C, 1.2311, D2/1.2379, H13/1.2344, CR12MOV, DC53, CR8,..
D4: ?
A4: ,!,.