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<=":12-><-;:宋體;">超聲波換能器,其是否等同于振子?以及,超聲波換能器與超聲波測井換能器,這兩個在本質上,是否相同?><=":12->
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<=":12-><-;:宋體;">超聲波測井換能器的運用壽命,取決于什么?以及,什么是它的共振點?><=":12->
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<=":12-><-;:宋體;">超聲波測井換能器功率的增大,是否能夠經過變幅桿來完成?><=":12->
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