打字猴:1.70099332e+09
1700993320
1700993321
1700993322 7-22 
1700993323
1700993324
1700993325 7-23 
1700993326
1700993327
1700993328 7-24 
1700993329
1700993330
1700993331 7-25 
1700993332
1700993333 7-26 A1=x0,A2=βx0+v0.
1700993334
1700993335 7-27 β=9.0/s,y=(-0.1+1.71t)e-9.0tm.
1700993336
1700993337
1700993338 7-28 
1700993339
1700993340 7-29 λ=0.061.
1700993341
1700993342 7-30 Q=2.32×103.
1700993343
1700993344 7-31 ω=ω0.
1700993345
1700993346 7-32 γ=1.6×10-3N·s/m,fM=1.0×10-3N.
1700993347
1700993348
1700993349 7-33 
1700993350
1700993351 7-34 0.07655~76.55m.
1700993352
1700993353 7-35 5.5×1014Hz.
1700993354
1700993355 7-36 (1)A=5.0cm,ω=4.0π/s,u=2.0m/s,λ=10cm;(2)x=(-3.0+10k)cm,k=0,±1,±2,….
1700993356
1700993357
1700993358 7-37 (1)λ=8cm; (2)
1700993359
1700993360
1700993361
1700993362 (3)(4)
1700993363
1700993364
1700993365 7-38 
1700993366
1700993367 7-39 ξB=5cos(4πt-1.71π)cm.
1700993368
1700993369 7-40 略.
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