What is the shelf life of 3M's filtering facepiece respirators?

3M随弃式吸防护口罩的存放期是多长时间？

The wort holding tank receives the first wort from the various filters batchwise.

暂存罐从分批操作的各个压滤机接收头道。

Filter out all the dirt before using the water.

用水前先将其中不清洁的东西过滤掉。

A liquid filters through a strainer,into the receptacle beneath.

液体经过过滤器流入下面的容器。

Foreign influence began to filter into the country.

外国势力开始渗进这个国家。

Inside, sunlight filtered dustily through rows of high windows and settled over the empty pews.

里面，阳光从长窗的格栅上带着灰尘筛下来落空空的排椅上。”

The solid particles were filtered from the solution.

固体微粒是从溶液中过滤出来的。

You can still see the gas or nebulosity in big telescopes and the right filters.

用大望远镜和适度的滤色镜，你也可看到那些气体或星云状物。

The existing problem in operation of siphonal sand filter and innovation were introduced.

介绍了虹吸式砂滤器运行过程中出现的问题及改造措施。

Water filters through the sandy soil and into the well.

水过沙土渗到井里。

Provides a 6dB-per-octave rolloff filter at 115Hz.

提供一个115赫兹时每八度6分贝的低频上移滤波器。

The characteristics of filter between no precoat and precoat were compared.

介绍了江苏省内精密过滤器的使用情况,对比了不预涂和预涂过滤器的特点。

Sounds of cheering filtered in through the closed window.

欢过关闭的窗户传了进来。

The autoptic results show that the filter plates produced by this technology have good performance.

现场试验表明,该工艺生产的过滤板有较好的使用性能。

In the meantime, mechanisms against desynchronization attacks and cepstrum filtering are introduced to enhance robustness.

同时，通过引入抗异步攻击的机制和倒谱滤波，增强了算法的鲁棒性。

Includes AC battery recharger, charging stand, pipette holder with safety valve, and filter.

包括交流电池充电器，充电器座，移液器 架（带安全阀，及过滤器等）。

This metal net filters out the dirt.

这个金属网滤掉污物。

Ends of the tegular filters (10) are cut off crosswise to make the end surfaces respectively form inclined surfaces such that vertical sections of the tegular filters (10) are in a rough trapezoid.

瓦状滤波器(10)的端部被斜向切除使端面分别形成斜面，从而瓦状滤波器(10)的垂直截面呈大致梯形。

Scheme is proposed of using a computer on sline and digital fil-tering technique to perform digital filtering and lane identification of the phase signals of a port radio navigation system .

本文提出了采用单片机和数字滤波技术对一种港口双曲线无线电导航系统的相位信号进行滤波处理和巷识别的方案.

In the third part of the screen the residual water is pressed out of the sludge, at a minimum filter cake thickness, by the pneumatic counterpressure cone at the press discharge.

屏的第三部分，淤泥上残余的水份通过压力排放的反气动锥被压出来，形成最低厚度的泥饼状物。