B、<img width="86" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/34cdd4f7-e232-420c-987d-5a813f8d4700.jpg" />
C、<img width="83" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/23ad9bee-1948-4583-9a9c-4232dfe36bd8.jpg" />
D、ω<sub>0</sub>
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