3
.docЗАДАЧИ ДЛЯ СТУДЕНТОВ, ЖЕЛАЮЩИХ ПОВЫСИТЬ СВОЙ УРОВЕНЬ ЗНАНИЙ.
ПРИМЕРЫ ЗАДАЧ С ОТВЕТАМИ ПО ТЕМЕ "ГРУППЫ СИММЕТРИИ И СТРУКТУРНЫЕ КЛАССЫ ЦЕПЕЙ И СЛОЕВ
Ответы
|
№варианта |
Структурный класс(1) A B (2) A = B |
|
|
1 |
(1) |
Pc cmm, Z = 2(2mm; 2mm) |
|
(2) |
Pc cmm, Z = 4([2mm] 2) |
|
|
2 |
(1) |
Pl 1, Z = 1(1; 1) |
|
(2) |
Pl
|
|
|
3 |
(1) |
Pc 2mm, Z = 1(2mm; 2mm) |
|
(2) |
Pc mmm, Z = 2(2mm) |
|
|
4 |
(1) |
Pc mm2, Z = 1(m; mm2) |
|
(2) |
Pc mm2, Z = 3(m, mm2) |
|
|
5 |
(1) |
Pl 2, Z = 1(2; 2) |
|
(2) |
Pl 2/a, Z = 2(2) |
|
|
6 |
(1) |
Pc m, Z = 1(1; m) |
|
(2) |
Pc m, Z = 3(1, m) |
|
|
7 |
(1) |
Pc mmm, Z = 1(m; mmm) |
|
(2) |
Pc mmm, Z = 5(m, mmm) |
|
|
8 |
(1) |
Pl 2/m, Z = 1(2/m; 2/m) |
|
(2) |
Pl 2/m, Z = 1(2/m) |
|
|
9 |
(1) |
Pc 4122, Z = 4(2; 2) |
|
(2) |
Pc 4122, Z = 8(22) |
|
|
10 |
(1) |
Pc cm21, Z = 2(m; m) |
|
(2) |
Pc cm21, Z = 4(m2) |
|
|
11 |
(1) |
Pl 2, Z = 1(2; 2) |
|
(2) |
Pl 2/a, Z = 2(2) |
|
|
12 |
(1) |
Pc cmm, Z = 2(m; 2mm) |
|
(2) |
Pc cmm, Z = 6(m, 2mm) |
|
|
13 |
(1) |
Pc cmm, Z = 2(2mm; 2mm) |
|
(2) |
Pc mmm, Z = 2(2mm) |
|
|
14 |
(1) |
Pc 42/mmc, Z = 2(mmm; 2mm) |
|
(2) |
Pc 42/mmc, Z = 6(mmm, 2mm) |
|
|
15 |
(1) |
Pl 2/m, Z = 1(2/m; 2/m) |
|
(2) |
Cl mmm, Z = 2(mmm) |
|
|
16 |
(1) |
Pc c2m, Z = 2(m; m) |
|
(2) |
Pc c2m, Z = 4(m2) |
|
|
17 |
(1) |
Pl m, Z = 1(m; m) |
|
(2) |
Pl 2/m, Z = 2(m) |
|
|
18 |
(1) |
Pc ccm, Z = 2(m; 222) |
|
(2) |
Pc ccm, Z = 6(m, 222) |
|
,
Z
= 2(1)