class10ch3scienceexercise

1:14:53

53:37

16:33

38:41

8:42

2:01:54

5:36:54

20:12

20:47

1:54:27

1:15:24

2:23:50

36:37

4:12:37

35:33

1:08:36

6:46:42

2:50:24

47:47

12:15

1:32:12

3:13:16

39:08

11:27

9:00

2:58:57

1:09:21

5:21:16

1:02:32

1:23:56

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27:02

8:04

24:00

33:40

11:55

43:23

34:55

1:29:49

11:41

1:11:03

8:10

1:41:20

24:26

1:39

3:51

41:10

14:08

31:33

22:51

12:33

44:51

2:42:47

10:02

2:49:01

10:19

6:01

4:08:25

20:57

37:47