Electroacoustics. Simulators of human head and ear. Part 3: acoustic coupler for the calibration of supra-aural earphones used in audiometry.
电声学。人头和耳模拟器。第3部分：用于听力仪的高级听力耳机校正用听力耦合器。
A needle aspiration biopsy device (20) includes a syringe (28), a valve coupler (25) for controlling a vacuum in the syringe barrel (30), and an anti-reflux head.
一种针抽吸活组织检查设备(20)，包括注射器(28)、控制注射器筒(30)内真空的阀门连接器(25)以及防回流头部。
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