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2Â¥: Originally posted by sweety at 2013-04-09 09:35:36
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huyueming321

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5Â¥: Originally posted by sweety at 2013-04-10 08:58:45
Ultrasound can be used for medical imaging, detection, measurement and cleaning. At higher power levels, ultrasonics is useful for changing the chemical properties of substances.Äã¿´Ò»ÏÂÕâ¸ö¾ÍÖªµÀÁË ...

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6Â¥: Originally posted by huyueming321 at 2013-04-10 20:02:05
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