acoustic impedance
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A vessel the passage of which is not to be impeded()to comply with this Rule when the two vessels are approaching one another so as to involve risk of collision.
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A vessel not to impede the passage of another vessel is not relieved () taking collision-avoiding action.
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阻抗复合消声器impedance muffler
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zero output impedance
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What, according to your textbook, is the term for anything that impedes the communication of a message?
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These 2 halls are all equipped with first-class acoustic paneling systems, modular seating systems and star-quality backstage facilities.这两个大厅都配有一流的声学镶板系统、组合式的座椅系统以及星级的后台设施。
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利用声学浅地层剖面仪的原理是:不同介质(这里的不同介质包括水或是沙层及底泥层)中的声阻抗(acoustic impedance)不同,当声阻抗不同时,声波就会产生反射,这个反射信号会被声学感测器记录下来。