细菌生产量与浮游植物毛生产量比值平均为0.15。
The average ratio of bacterial production to phytoplankton gross production was measured as 0.15.
通常取得居民对房屋承受能力的方法是计算出平均房价与居民平均收入的比值，因为这些收入最终要在贷款的协助下购买房屋。
A common measure of affordability is the ratio of average house prices to average earnings, since income must ultimately pay for the acquisition of a property financed with a loan.
如果把贫富排行榜上前五个州的平均人均GDP和后五个州的平均人均GD P作对比，这个比值的变化幅度会小一些，但仍将呈上升趋势。
The change is less pronounced if you average GDP per head in the five richest and five poorest states, but it still holds.
将叶绿素及其与悬浮质的比值的平均数作为对生物量的衡量指标。
The averages of chlorophyl and its ratio with ss were used as the measure indices of biomass.
然后再对所有的期货商品，以持仓金额为权重，计算对于基期数据比值的加权算数平均值，得到指数值。
To get the index, we firstly compute the mathematic average for single commodity price, using price and trading volume of all contracts.
而在国际上，这一比值的平均水平是30%。
无论是从较长的时间尺度还是从较大的空间范围来看，平均波速比值都是非常稳定的。
The average velocity ratios are very steady, whatever in the long time scale or large spatial scale.
对于楼之间空间较小的街谷，背风面和迎风面的示踪剂浓度平均比值可达8。
The ratio of mean tracer concentrations on leeward side to that on wind-ward side was about8 for street canyons where the space between buildings was small.
提出一个评价气动发动机性能的新指标——气动发动机平均有效压力和缸内平均压力的比值。
A new index is proposed to evaluate performance of the air-powered engine-the ratio of the mean effective pressure and the average pressure in the engine cylinder.
最长与最短染色体比值变化较大，为2.78～3.20； 平均臂比、着丝点指数、核型不对称系数、相对长度变化范围较小。
The ratio of the longest chromosome to the shortest range in 2.78~3.20. And index, index of karyotypic asymmetry and relatived length changed indistinctly.
单位砂浆体积下集料的表面积的变化对邻近集料表面最近间距的平均值有影响，但二者之间的比值并非常数。
The surface area of aggregate per unit volume of mortar does have influence on the mean value of the nearest surface spacing, but the ratio between them is not constant.
关联维数的最大差值与平均值之比值可以用来判断液压缸是否存在爬行现象。
The ratio of the maximum difference and the average value of correlative dimension can be used to decide whether creeping phenomenon of hydraulic cylinder exists.
将疲劳切口系数定义为临界距离法得出的平均应力与热点应力之比值。
The fatigue notch factor is introduced as the ratio of average stress over the region of a critic distance around critic point to the hot spot stress.
即使如此，目前净财富对收入的比值仍然相当于过去50年来的平均水平。
Even so, the ratio of net worth to income is still equal to the average of the past 50 years.
信噪比：平均到一个数据单元的信号与随机噪声的比值。
Signal to Noise Ratio( SNR): The ratio of the signal to the random noise in a set of data.
一个电传打印机的带宽是300hz，信道内所传信号的平均功率与白热噪声功率的比值为3分贝，问其信道容量是多少？
What is the channel capacity for a teleprinter channel with a 300-hz bandwidth and a signal-to-noise ratio of 3 dB, where the noise is white thermal noise?
研究表明，甲烷团簇爆炸后离子获得的平均动能和离子的初始平均静电势能的比值，与团簇的尺寸大小无关。
It is found that the ratio of the average kinetic energy of the ions to their initial average electrostatic potential energy is irrelevant to the cluster size.
消光比是指在最坏反射条件时，全调制条件下，逻辑“1”平均光功率与逻辑“0”平均光功率的比值。
Extinction ratio is ratio of logic "1" average optical power to logic "0" average optical power under the worst reflection and complete modulation condition.
方法采用实时超声对75 0例妊娠16～40周正常孕妇的胎儿心脏及胸腔径线的测量和面积计算，并得出每一孕龄组的胎儿心脏面积与胸腔面积的平均比值。
Methods Among 750 normal pregnant women with gestational ages from 16 to 40 weeks underwent ultrasonographic measurement of the fetal heart and chest diameters and areas.
结果表明，水稻田土壤有机碳、全氮和全磷含量水平均较高，水田改为旱地后土壤有机碳、全氮含量及C/N比值有较大幅度的下降，但全磷含量变化不大。
The results showed that the content of SOC, STN and STP had a high level in the paddy soil, but SOC and STN(except STP) decreased greatly after being changed to arid land.
结果表明，水稻田土壤有机碳、全氮和全磷含量水平均较高，水田改为旱地后土壤有机碳、全氮含量及C/N比值有较大幅度的下降，但全磷含量变化不大。
The results showed that the content of SOC, STN and STP had a high level in the paddy soil, but SOC and STN(except STP) decreased greatly after being changed to arid land.
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