ultrasound transducer physics

8:17

5:17

16:32

21:09

کوتاه

3:24

1:53

1:21

4:03

9:48

8:12

کوتاه

6:41

2:50

2:17

3:44

1:18

4:24

1:01:41

11:46

27:32

35:01

1:12:33

1:31:06

6:18

15:34

9:51

27:30

19:43

32:15

2:15

19:27

35:27

26:17

27:52

30:41

25:19

16:44

26:15

25:25