感染的高频率与侵入设备的使用，特别是中央线，导尿管和通风设备密切相关。
High frequency of infection is associated with the use of invasive devices, in particular central lines, urinary catheters, and ventilators.
在试验装置上进行了冷却塔噪声模拟试验，试验装置较好地模拟了火电厂湿式自然通风冷却塔的中高频噪声特性。
The middle and high-frequency noise of the wet-style natural-ventilation cooling tower is simulated by test rig in tab.
一个具有通风和扩展高频响应的知识- 3是间接费用或声乐器详细繁殖的理想灵活的设备。
A flexible workhorse with an airy and extended high frequency response the KM-3 is ideal for overheads or detailed reproduction of acoustic instruments.
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