21.13: Chapter 13
( \newcommand{\kernel}{\mathrm{null}\,}\)
Multiple Choice
1. d
3. c
5. a
7. a
10. b
11. c
13. d
15. a
17. a
19. d
21. c
23. b
Fill in the Blank
1. frowning
3. surprise
5. Papez circuit