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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(gè)在本質(zhì)上，是否相同？<=":12->
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<=":12-><-;:宋體;">超聲波測井換能器的運(yùn)用壽命，取決于什么？以及，什么是它的共振點(diǎn)？<=":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(jīng)過變幅桿來完成？<=":12->
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