查询词典 db

According to audio-noise meter ( 1 meter distance ) the noise level was fixed at 35.7 dB .

据音频噪声米（ 1米距离）的噪音水平，是固定的占35.7分贝。

If the ratio is higher than 10 dB, the downlink SIR at that cell is OK.

如果这个比值大於10dB。这个格子的干扰就在可接受的范围内。

The 15 low frequency driver combines 96 dB sensitivity with 1000 Watts power handling, to deliver LF sound pressure levels well beyond those typical of systems its size.

在15低频驱动器结合96分贝1000瓦灵敏度功率处理能力，能够提供远远超过低频声压水平的典型系统的大小。

An elliptical parabola with the same dimensions would have smaller gain by about 1 dB in relation to this analyzed rectangular, with the same efficiency, because of smaller geometric surface of the elliptic parabola.

一个同样尺寸，同样效率的椭圆形抛物线反射器，比这个长方形反射器低大约1dB的增益，这是由于椭圆形抛物面几何表面小一些。

Using this scheme, label abstraction and erasion can be realized with the extinction ratio of 9.72 and 7.05 dB, respectively.

仿真表明，通过这种方案可以分别实现消光比为9.72dB和7.05dB的标签提取和标签擦除。

The design of a surface acoustic wave filter with a center frequency of 44?MHz, a 1?dB bandwidth of 8?MHz, an out-of-band rejection of more than 60?

采用数字傅里叶变换技术设计并制作了一个中心频率为44MHz，1dB带宽为8MHz，带外抑制大于60dB，插损小于28dB的带通滤波器。

For investigating the performance of our method, it has been evaluated to simulate a uniform segment of rectangular waveguide. The more lower fictitious return wave loss, which is lower -10 dB than the one yielded from the first order absorbing boundary condition, is illustrated in our method.

通过对一段均匀直波导的计算，验证该算法比使用一阶吸收边界条件的时域有限元法，虚假剩余反射回波平均要低10dB以上，达到了工程计算的要求。

Sand making machine we offer has features of high performance in going through uncrushed materials, small influence by humidity (humidity can amount to 8%), end products with cubic shape, low flakiness rate, low noise (less than 95 db) and low dust.

可广泛应用于水电、公路、建筑、水泥、金属矿山等行业的细碎作业，产品粒形呈立方体，针片状含量低，在机制建筑砂、石料以及各种冶金矿渣的破碎中更是得到普遍使用，与其它类型的破碎机相比产量功效高。

The factors included the type of extractant, the amount and the extraction times, the type of purified column, the type and dosage of eluviatant about the pre-treatment of the samples. The extraction was 3 minutes (13500rpm) of high speed homogenize extraction. 50mL acetonitrile as an extractant was acted on one time extraction. The florin silicon column was taken as the purified column. The extraction was eluted by 30ml 3:2 acetone - hexane and concentrated by nitrogen blowing under 50 °C water bath.The chromatographic separated conditions were studied applied the Agilent 6890 gas chromatographic apparatus and DB-17 capillary column(30m×0.25mm×0.25μm).

研究了提取剂种类、用量与提取次数，净化柱种类，淋洗剂种类与用量，提取方式与提取时间，柱温和柱流量等因素对油菜籽中有机磷农药残留提取、分离净化和色谱分离的影响，建立了采用高速匀浆提取方式提取3min13500rpm.min~(-1，以50mL乙腈为提取剂一次提取，以弗罗里硅柱为样品液净化柱，以30mL 3：2丙酮-正己烷为淋洗剂，在50℃水浴条件下用氮吹浓缩，气相色谱检测的油菜籽有机磷农药多种残留检测技术。

The range of the colour scale is always 12 db, and the maximum is adjusted for each individual frequency band.

范围颜色的规模是历来12分贝，并把最高的是调整为每频段。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。