1-5 DDDBD
6-10 CBDDC
11-15 CBCBC
16, g=4Π2l / T2, AC, 图3,BC,√l ,4Π2/k2, C , 0.04
17. f=(4n+3)/0.12 Hz, n= 0,1,2….
V=40n+30 m/s , n= 0,1,2….
18. 0.3m/s,(0.8+n)m/s,n= 0,1,2….
19. 1m/s, 0.5m/s, 0.25J.
20.
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