穿孔的

The construction and properties of the absorption curve of microperforated panel absorber are discussed.

引言微穿孔板吸声器是1966年发展，为吸收高温、高湿度下的强噪声而设计的。

Absorption curve of four micro-perforated panel is the best in three different structure. But its performance is close to three layer micro-perforated panel.

优化后的四层微穿孔板结构在整个频率内的吸声系数曲线最为饱满，但是与三层结构相比，吸声性能提高不多。

Based on the theoretical and experimental studies in electrical and mechanical parameters, micro-perforated absorption material in the box, and positions optimization of the actuators and attached masses on the panel, several optimization methods for the acoustic performance of panel speaker are proposed.

基于对平板扬声器电－力参数测量、箱体内衬微穿孔吸声材料、驱动器以及附加质量位置优化的理论研究和实验测试，提出了若干种提高平板扬声器声性能的方法。

MethodsAnalysis of CT manifestations in 23 cases proved by operation and needle aspiration. Causes: acute appendicitis 13 cases, ascending colon perforation 1 case, Meckel diverticulitis 2 cases, cause obscured 7 cases. Bolus injection of contrast medium was given in 19 cases.

对23例经手术和穿刺针吸证实的腹腔脓肿的CT表现进行分析，急性阑尾炎13例，升结肠穿孔1例，美克尔憩室炎2例，感染源不明确7例。19例行平扫与增强检查，4例仅平扫检查。

They conceived the idea of a punch card which would be inserted into the computer, read, and stored.

他们构思出一种能插入计算机的穿孔卡片的想法，这种卡片能够读取和储藏数据。

A line of punch positions parallel to the Y datum line of a punch card.

和卡片的y基准线平行的一行穿孔位置。

Drinklid, from Teich AG (part of Constantia Flexibles Group) which features an innovative co-extruded double layer film with laser perforation, was awarded an Alufoil Trophy 2009 for its use on milkshake drink cups from Tine, of Norway.

Drinklid从泰希公司，的具有创新共挤激光穿孔双层膜，铝箔被授予2009年的奖杯从蒂奶昔，饮料杯，挪威，使用。

The layer assignment, also called constrained via minimization, is to determine which layers can be used for routing the wire segments such that the number of vias can be minimized.

布局层指定是决定布局中各线段的布局层位置使得布局所产生的穿孔数能尽量少。

Objective To investigate the methods of dealing with corneal perforation and effect of sodium hyaluronate used in the operation.

目的 探讨角膜穿孔伤的处理及透明质酸钠在缝合术中的作用。

An output unit that produces a record of data in the form of hole patterns in ''.

一种输出装置，它在穿孔卡上产生以孔的模式表示的数据记录。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。