查询词典 db

Study of long-term residents in the vicinity of the airport, flight movements during sleep prone to the effects of noise, noise, if more than 35 db, the rapid rise in blood pressure will lead to long-term health risks associated with, the higher the risk of suffering from high blood pressure.

研究表示，长期居住在机场附近的居民，睡眠时易受航班升降噪音的影响，噪音若超过35分贝，会令血压急速上升，长期会危害健康，患高血压的风险较高。

Another Product of 2.5 millimeters, the area density of 5 kg, and single-layer sound insulation material can reach 29 db.

另有2.5毫米的产品，面密度5公斤，单层材料的隔声量可以达到29分贝。

The results of the simulation analysis and experiments indicate that the loss of ultraviolet scattering transmission in atmosphere is high because of the particle scattering and absorbing in solar-blind zone; that is, the received power can descend 20 dB with the distance increasing 10 times. Therefore, the ultraviolet scattering is fit for short range communication. In short range, the pulse extension due to scattering is at microsecond order and its influence for low and moderate bit rate communication systems is weak. Since the light output power of a single ultraviolet LED is low, a multi-LED array can be used to increase the transmit power and extend the communication range.

仿真分析与实验结果显示：日盲区紫外光在大气中散射传输时由于大气粒子的强烈散射与吸收，传输损耗较大，距离每增加10倍，接收功率下降20dB，因此日盲区紫外光大气散射通信适用于近距离通信场合；近距离传输时散射造成的光脉冲多径展宽为微秒量级，对中低速通信系统影响较小；单个紫外LED发光功率较低，可通过多个LED阵列来提高发射功率，增大通信距离。

Loading fastfile 'code_post_gfx' used 1.13 MB memory in DB alloc Setting initial state...

载入中fastfile ' code_post_gfx ' 1.13 MB内存用于在数据库alloc 设置初始状态。。。

The filters are fully programmable for 3 dB bandwidths from 6 MHz to 43 MHz.

该过滤器是由6兆赫带宽完全可编程3分贝至43兆赫。

Low insertion loss, 0.3 dB typ.

低插入损耗，0.3分贝典型。

A method used to simutaniously analyze the residues of herbicides 2, 4-dichlorophenoxyacetic acid (2,4-D), 2-(2,4-dichiorophenoxy) propanoic acid (2,4-DP) and 2,4-dichiorophenoxybutyric acid (2,4-DB) in garlic was developed in our study.

本研究建立了一种应用基质固相分散－高效液相色谱法，同时测定大蒜中2，4-二氯苯氧乙酸、2，4-二氯苯氧丙酸及2，4-二氯苯氧丁酸等3种2，4-D类除草剂残留的方法。

Given the compression process contains no contacting parts and hence no vibration, the noise is airborne and allows very effective control and minimisation down to 69 dB.

且空压机内部压缩过程无相关接触零件及震动，因此可把噪音减至69分贝。

In other designs I have used as little as 26 dB (at 20 kHz) with good results.

而其它设计，我采用少至26分贝（at 20 kHz）的，结果不错。

Greater than 60 dB, 20 Hz to 20 kHz

大于60分贝， 20赫兹到20赫兹

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。