16. D
17. C
Untuk (1) sendi sendi putar, (2)
sendi engsel, (3) sendi peluru, (4)
sendi pelana
18. B
19. C
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16. D
17. C
Untuk (1) sendi sendi putar, (2)
sendi engsel, (3) sendi peluru, (4)
sendi pelana
18. B
19. C